-35.84% is the change from 996 to 639
Calculation steps:
[( 639 - 996 ) ÷ 996] x 100 = -35.84%
Formula
Percentage change = [(639 - 996) / 996] x 100
Subtract the new number by the original number
639 - 996 = -357
-357 ÷ 996 = -0.35843373493975905
-0.35843373493975905 x 100 = -35.84%