-72.32% is the change from 820 to 227
Calculation steps:
[( 227 - 820 ) ÷ 820] x 100 = -72.32%
Formula
Percentage change = [(227 - 820) / 820] x 100
Subtract the new number by the original number
227 - 820 = -593
-593 ÷ 820 = -0.723170731707317
-0.723170731707317 x 100 = -72.32%