Anyway, neat infographic OP. I'm not surprised that China has so many billionaires, nor that New York had as many as it does. In fact, if I would have had to guess before looking at the number I probably would have guessed it was in the hundreds. Manhattan alone is the home of tons of rich folks--but I guess $1B is truly a lot of money.
And why were so many new billionaires made in 2020? My guess is the performance of the stock market, which has made a lot of newly-wealthy individuals. Even people who have no clue what they're doing in the stock market have made fortunes. It's a crazy time we're living in.