-33.58% is the change from 962 to 639
Calculation steps:
[( 639 - 962 ) ÷ 962] x 100 = -33.58%
Formula
Percentage change = [(639 - 962) / 962] x 100
Subtract the new number by the original number
639 - 962 = -323
-323 ÷ 962 = -0.33575883575883575
-0.33575883575883575 x 100 = -33.58%