-36.36% is the change from 990 to 630
Calculation steps:
[( 630 - 990 ) ÷ 990] x 100 = -36.36%
Formula
Percentage change = [(630 - 990) / 990] x 100
Subtract the new number by the original number
630 - 990 = -360
-360 ÷ 990 = -0.36363636363636365
-0.36363636363636365 x 100 = -36.36%