By Svea Herbst-Bayliss (Reuters) – The 20 best performing hedge fund managers earned $22.4 billion for investors in 2022, marking their slimmest gains since 2016 as many firms, including Tiger Global Management, struggled with slumping financial markets, LCH Investments data show. The top 20 managers, led by Ken Griffin’s Citadel, Bridgewater Associates and D.E. Shaw Group, made less than half of the $65.4 billion the group returned in 2021 when rising stock prices led to a record return. In comparison, they made $63.5 billion in 2020 and $59.3 billion in 2019. In 2022, when fears of rising in…