-84.33% is the change from 817 to 128
Calculation steps:
[( 128 - 817 ) ÷ 817] x 100 = -84.33%
Formula
Percentage change = [(128 - 817) / 817] x 100
Subtract the new number by the original number
128 - 817 = -689
-689 ÷ 817 = -0.8433292533659731
-0.8433292533659731 x 100 = -84.33%