-21% is the change from 824 to 651
Calculation steps:
[( 651 - 824 ) ÷ 824] x 100 = -21%
Formula
Percentage change = [(651 - 824) / 824] x 100
Subtract the new number by the original number
651 - 824 = -173
-173 ÷ 824 = -0.2099514563106796
-0.2099514563106796 x 100 = -21%