-21.06% is the change from 812 to 641
Calculation steps:
[( 641 - 812 ) ÷ 812] x 100 = -21.06%
Formula
Percentage change = [(641 - 812) / 812] x 100
Subtract the new number by the original number
641 - 812 = -171
-171 ÷ 812 = -0.2105911330049261
-0.2105911330049261 x 100 = -21.06%