-79.88% is the change from 815 to 164
Calculation steps:
[( 164 - 815 ) ÷ 815] x 100 = -79.88%
Formula
Percentage change = [(164 - 815) / 815] x 100
Subtract the new number by the original number
164 - 815 = -651
-651 ÷ 815 = -0.7987730061349694
-0.7987730061349694 x 100 = -79.88%