以下數字可供大家參考：
1929 大肅條：679個交易日，累跌 86%
1987 石油危機：72個交易日，累跌 34%
2001 科網爆破：638個交易日，累跌 49%
2007 金融海嘯：356個交易日，累跌 57%

現時：自高位19個交易日，累跌 28%。

If you are wondering when will the worst be over, here are some figures:
1920 Great Depression: 679 trading days, 86% drop
1987 Oil Crisis: 72 trading days, 34% drop
2001 Dotcom Bubble: 638 trading days, 49% drop
2007 Great Recession: 356 trading days, 57% drop

Right now: 19 trading days, 28% drop.