-21.92% is the change from 812 to 634
Calculation steps:
[( 634 - 812 ) ÷ 812] x 100 = -21.92%
Formula
Percentage change = [(634 - 812) / 812] x 100
Subtract the new number by the original number
634 - 812 = -178
-178 ÷ 812 = -0.21921182266009853
-0.21921182266009853 x 100 = -21.92%