By Lars Mucklejohn The world’s 20 richest people have added around $700bn to their combined wealth over the last year, according to Forbes latest rich list. The business magazine on Tuesday published its annual ranking of the world’s 200 wealthiest people, revealing that tech tycoons had enjoyed a massive boost on the back of a frenzy for AI products and the success of Nasdaq 100 stocks. Facebook founder Mark Zuckerberg saw the biggest increase in his estimated net worth, from $113bn in 2023 to $177bn in 2024. Just three Brits made the top 200: hedge fund manager Michael Platt in 104th ($18bn)…