-39.29% is the change from 990 to 601
Calculation steps:
[( 601 - 990 ) ÷ 990] x 100 = -39.29%
Formula
Percentage change = [(601 - 990) / 990] x 100
Subtract the new number by the original number
601 - 990 = -389
-389 ÷ 990 = -0.3929292929292929
-0.3929292929292929 x 100 = -39.29%