Since 3 May, HSI and STI had tumbled 2,298 points (12.1%) and 222 points (8.0%) respectively. If we compare the intraday high of 3 May vs the intraday low of 18 May, the decline for HSI and STI would have been a steeper 2,635 points (14.1%) and 251 points (9.1%) respectively.