-80.78% is the change from 817 to 157
Calculation steps:
[( 157 - 817 ) ÷ 817] x 100 = -80.78%
Formula
Percentage change = [(157 - 817) / 817] x 100
Subtract the new number by the original number
157 - 817 = -660
-660 ÷ 817 = -0.8078335373317014
-0.8078335373317014 x 100 = -80.78%