-33.64% is the change from 990 to 657
Calculation steps:
[( 657 - 990 ) ÷ 990] x 100 = -33.64%
Formula
Percentage change = [(657 - 990) / 990] x 100
Subtract the new number by the original number
657 - 990 = -333
-333 ÷ 990 = -0.33636363636363636
-0.33636363636363636 x 100 = -33.64%