it's 18% percent.
current market cap is 465 billion [yahoo data]
market cap 10 days ago was 565 billion (465 + 100)
drop is 100B/565B = ~18% over the last ten days.
share price now back to july '17 price, wiping out 9 months of gains.
i'd also posit that there will be more to come to light.
loose data practices costs points!