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Microsoft co-founder Bill Gates once again topped the Forbes magazine list of the world's richest billionaires, while US President Donald Trump slipped more than 200 spots.

Gates, whose wealth is estimated at $86 billion, led the list for the fourth straight year.

He was followed by Berkshire Hathaway chief Warren Buffett - with an estimated wealth of $75.6billion, before a bevy of American tech giants dominated the rest of the top ten.