-83.9% is the change from 820 to 132
Calculation steps:
[( 132 - 820 ) ÷ 820] x 100 = -83.9%
Formula
Percentage change = [(132 - 820) / 820] x 100
Subtract the new number by the original number
132 - 820 = -688
-688 ÷ 820 = -0.8390243902439024
-0.8390243902439024 x 100 = -83.9%