The World's Billionaires

Columns: No | Name | Net worth ( USD ) | Age | Nationality | Source ( s ) of wealth
1 | Warren Buffett | $ 62.0 billion | 77 | United States | Berkshire Hathaway | 2 | Carlos Slim | $ 60.0 billion | 68 | Mexico | América Móvil , Grupo Carso | 3 | Bill Gates | $ 58.0 billion | 52 | United States | Microsoft | 4 | Lakshmi Mittal | $ 45.0 billion | 57 | India | Arcelor Mittal | 5 | Mukesh Ambani | $ 43.0 billion | 51 | India | Reliance Industries | 6 | Anil Ambani | $ 42.0 billion | 48 | India | Anil Dhirubhai Ambani Group | 7 | Ingvar Kamprad | $ 31.0 billion | 81 | Sweden | IKEA | 8 | Kushal Pal Singh | $ 30.0 billion | 76 | India | DLF Group | 9 | Oleg Deripaska | $ 28.0 billion | 40 | Russia | Rusal | 10 | Karl Albrecht | $ 27.0 billion | 88 | Germany | Aldi Süd

Example questions:
What is the 2008 annual ranking of the CEO of Berkshire Hathaway ? | What is the 2008 annual ranking of the billionaire who had been criticized for his business tactics , which have been considered anti-competitive ? | What is the age of the billionaire whose source of wealth is from the world 's second largest aluminium company as of 2008 ? | What is the birth year of the world 's billionaire with the lowest ranking in 2008 ?

Answers:
1 | 3 | 40 | 1920