-79.39% is the change from 815 to 168
Calculation steps:
[( 168 - 815 ) ÷ 815] x 100 = -79.39%
Formula
Percentage change = [(168 - 815) / 815] x 100
Subtract the new number by the original number
168 - 815 = -647
-647 ÷ 815 = -0.7938650306748466
-0.7938650306748466 x 100 = -79.39%