-74.49% is the change from 831 to 212
Calculation steps:
[( 212 - 831 ) ÷ 831] x 100 = -74.49%
Formula
Percentage change = [(212 - 831) / 831] x 100
Subtract the new number by the original number
212 - 831 = -619
-619 ÷ 831 = -0.7448856799037304
-0.7448856799037304 x 100 = -74.49%