New Delhi: With a networth of $21 billion, Reliance Industries (RIL)' Mukesh Ambani has retained his title as India's richest for sixth year in a row, while the country's 100 richest persons saw their collective wealth soar by a modest 3 per cent in a year, according to Forbes wealth list.NRI steel tycoon Lakshmi Mittal ($16 billion) also continues to hold the second position, while Sun Pharmaceuticals Industries' Dilip Shanghvi has jumped to third place with about 50 per cent surge in his wealth to $13.9 billion, pushing Wipro's Azim Premji to fourth place ($13.8 billion).As per US-based business magazine Forbes' annual list of India's 100 richest, their total wealth grew by a modest 3 per cent from a year ago to $259 billion."Growth in wealth was lacklustre due to India's stumbling economy, which has been hit by inflation and a falling rupee," Forbes rich list showed.Amid the sluggishness, Reliance Industries chief Mukesh Ambani and ArcelorMittal's Lakshmi Mittal saw no change in their respective networths, but pharmaceutical industry titan Dilip Shanghvi managed to buck the trend with a surge of $4.7 billion in his wealth to $13.9 billion.Azim Premji's wealth also rose by $1.6 billion, but he could not retain his third slot.Pallonji Mistry, patriarch of construction giant Shapoorji Pallonji Group which is the biggest shareholder in Tata Sons, has moved down one place to fifth rank with a networth of $12.5 billion. His younger son Cyrus Mistry last year succeeded Ratan Tata as new Tata group head.NRI businessmen Hinduja brothers have moved up to sixth place ($9 billion), from their 9th position last year.Shiv Nadar ($8.6 billion) have moved into top-ten at the 7th place, while Sunil Mittal has also returned to this league at 10th place ($6.6 billion). On the other hand, Essar group's Ruia brothers and Jindal group's Savitri Jindal have moved out from the group.Adi Godrej has slipped two places to 8th rank ($8.3 billion), while Aditya Birla group Chairman Kumar Mangalam Birla has gained one position to 9th ($7.6 billion).Anil Ambani has also retained his 11th rank, although his wealth rose to $6.2 billion, from $6 billion a year ago.Here is the complete list: 20. Bajaj FamilyNet Worth: $3.1 BSource of Wealth: Motorcycles, inherited and growingResidence: Pune, IndiaCountry of Citizenship: India19. Desh Bandhu GuptaNet Worth: $3.2 BAge: 75Source of Wealth: pharmaceuticals, self-madeResidence: Mumbai, IndiaCountry of Citizenship: IndiaEducation: Master of Science, Bombay UniversityMarital Status: MarriedChildren: 518. Kushal Pal SinghNet Worth: $3.4 BAge: 82Source of Wealth: real estate, inherited and growingResidence: New Delhi, IndiaCountry of Citizenship: IndiaEducation: Bachelor of Arts / Science, Delhi UniversityMarital Status: MarriedChildren: 317. Anand BurmanNet Worth: $3.7 BAge: 61Source of Wealth: Consumer goods, inherited and growingResidence: New Delhi, IndiaCountry of Citizenship: IndiaEducation: Bachelor of Arts / Science, University of KansasMarital Status: MarriedChildren: 216. Cyrus PoonawallaNet Worth : $4 BAge: 72Source of Wealth: biotech, inherited and growingResidence: Pune, IndiaCountry of Citizenship: IndiaEducation: Doctorate, Pune University; Bachelor of Arts / Science, Pune UniversityMarital Status: WidowedChildren: 115. Uday KotakNet Worth: $4.1 BAge: 54Source of Wealth: banking, self-madeResidence: Mumbai, IndiaCountry of Citizenship: IndiaEducation: Master of Business Administration, University of Bombay; Bachelor of Arts / Science, Bombay UniversityMarital Status: MarriedChildren: 214. Savitri Jindal & familyNet Worth: $4.9 BAge: 63Source of Wealth: steel, inheritedResidence: Hisar, IndiaCountry of Citizenship: IndiaMarital Status: WidowedChildren: 913. Micky JagtianiNet Worth: $5 BAge: 62Source of Wealth: retail, inherited and growingResidence: Dubai, United Arab EmiratesCountry of Citizenship: IndiaMarital Status: MarriedChildren: 312. Shashi & Ravi RuiaNet Worth: $5.5 BSource of Wealth: diversified, inherited and growingResidence: Mumbai, IndiaCountry of Citizenship: India11. Anil AmbaniNet Worth: $6.2 BAge: 54Source of Wealth: diversified, inherited and growingResidence: Mumbai, IndiaCountry of Citizenship: IndiaEducation: Bachelor of Arts / Science, University of Bombay; Master of Business Administration, University of Pennsylvania Wharton SchoolMarital Status: MarriedChildren: 210. Sunil Mittal & familyNet Worth: $6.6 B Age: 56Source of Wealth: telecom, self-madeResidence: New Delhi, IndiaCountry of Citizenship: IndiaEducation: Bachelor of Arts / Science, Punjab UniversityMarital Status: MarriedChildren: 39. Kumar BirlaNet Worth: $7.6 BAge: 46Source of Wealth: commodities, inherited and growingResidence: Mumbai, IndiaCountry of Citizenship: IndiaEducation: Master of Business Administration, London Business School; Bachelor of Arts / Science, University of BombayMarital Status: MarriedChildren: 38. Adi Godrej & familyNet Worth: $8.3 BAge: 71Source of Wealth: Consumer goods, inherited and growingResidence: Mumbai, IndiaCountry of Citizenship: IndiaEducation: Bachelor of Arts / Science, Massachusetts Institute of Technology; Master of Science, Massachusetts Institute of TechnologyMarital Status: MarriedChildren: 37. Shiv NadarNet Worth: $8.6 BAge: 68Source of Wealth: information technology, self-madeResidence: New Delhi, IndiaCountry of Citizenship: IndiaEducation: Bachelor of Arts / Science, PSG College of TechnologyMarital Status: MarriedChildren: 16. Hinduja BrothersNet Worth: $9 BSource of Wealth: Diversified, inherited and growingResidence: London, United Kingdom5.Pallonji MistryNet Worth: $12.5 BAge: 84Source of Wealth: construction, inherited and growingResidence: Mumbai, IndiaCountry of Citizenship: IrelandMarital Status: MarriedChildren: 44. Azim PremjiNet Worth: $13.8 BChairman, WiproAge: 68Source of Wealth: software, inherited and growingResidence: Bangalore, IndiaCountry of Citizenship: IndiaEducation: Bachelor of Arts / Science, Stanford UniversityMarital Status: MarriedChildren: 23. Dilip ShanghviNet Worth: $13.9 BAge: 58Source of Wealth: pharmaceuticals, self-madeResidence: Mumbai, IndiaCountry of Citizenship: IndiaEducation: Bachelor of Arts / Science, Calcutta UniversityMarital Status: MarriedChildren: 22. Lakshmi MittalNet Worth: $16 BChairman and CEO, ArcelorMittalAge: 63Source of Wealth: steel, inherited and growingResidence: London, United KingdomCountry of Citizenship: IndiaEducation: Bachelor of Arts / Science, St Xavier''s College CalcuttaMarital Status: MarriedChildren: 21. Mukesh AmbaniNet Worth: $21 BChairman, Reliance IndustriesAge: 56Source of Wealth: petrochemicals, oil & gas, inherited and growingResidence: Mumbai, IndiaCountry of Citizenship: IndiaEducation: Drop Out, Stanford University; Bachelor of Science in Engineering, University of BombayMarital Status: MarriedChildren: 3