-74.01% is the change from 831 to 216
Calculation steps:
[( 216 - 831 ) ÷ 831] x 100 = -74.01%
Formula
Percentage change = [(216 - 831) / 831] x 100
Subtract the new number by the original number
216 - 831 = -615
-615 ÷ 831 = -0.740072202166065
-0.740072202166065 x 100 = -74.01%