Out of 1,810 billionaires, just 190 are women, down from 197 in 2015. The richest self-made woman in the world is Zhou Qunfei, who is ranked 205th and valued at $5.9bn. She made her fortune by founding the touchscreen maker Lens Technology, whose biggest customers are Apple and Samsung. The wealth of Facebook’s founder, Mark Zuckerberg, grew by $11.2bn to give him a total net worth of $44.6bn. He is now the sixth-richest person in the world. Here is the Top 10 list: Bill Gates – 75bn; Amancio Ortega – 67 bn; Warren Buffet – 60.8 bn; Carlos Slim – 50 bn; Jeff Bezos – 45.2; Mark Zuckerberg – 44.6 bn; Larry Ellison – 43.6 bn; Michael Bloomberg – 40 bn; Charles Koch – 39,6 bn; David Koch – 39.6 bn. Most of them make important generous investments in the public benefit.