-75.83% is the change from 815 to 197
Calculation steps:
[( 197 - 815 ) ÷ 815] x 100 = -75.83%
Formula
Percentage change = [(197 - 815) / 815] x 100
Subtract the new number by the original number
197 - 815 = -618
-618 ÷ 815 = -0.758282208588957
-0.758282208588957 x 100 = -75.83%