The World's Billionaires

Columns: No | Name | Net worth ( USD ) | Age | Nationality | Source ( s ) of wealth
1 | Bill Gates | $ 76.0 billion | 58 | United States | Microsoft | 2 | Carlos Slim & family | $ 72.0 billion | 74 | Mexico | América Móvil , Grupo Carso | 3 | Amancio Ortega | $ 64.0 billion | 77 | Spain | Inditex | 4 | Warren Buffett | $ 58.2 billion | 83 | United States | Berkshire Hathaway | 5 | Larry Ellison | $ 48.0 billion | 70 | United States | Oracle Corporation | 6 | Charles Koch | $ 40.0 billion | 78 | United States | Koch Industries | 6 | David Koch | $ 40.0 billion | 73 | United States | Koch Industries | 8 | Sheldon Adelson | $ 38.0 billion | 80 | United States | Las Vegas Sands | 9 | Christy Walton & family | $ 36.7 billion | 65 | United States | Walmart | 10 | Jim Walton | $ 34.7 billion | 65 | United States | Walmart

Example questions:
When did the youngest 2014 World Billionaire co-found a company with Paul Allen ? | How many universities did the oldest 2014 World Billionaire attend ? | How many presidential campaigns was the 2014 World Billionaire 80 year old the largest donor of ? | When was the 2014 Spanish World Billionaire born ?

Answers:
1975 | four | two | 28 March 1936