-21.55% is the change from 812 to 637
Calculation steps:
[( 637 - 812 ) ÷ 812] x 100 = -21.55%
Formula
Percentage change = [(637 - 812) / 812] x 100
Subtract the new number by the original number
637 - 812 = -175
-175 ÷ 812 = -0.21551724137931033
-0.21551724137931033 x 100 = -21.55%