-25.49% is the change from 820 to 611
Calculation steps:
[( 611 - 820 ) ÷ 820] x 100 = -25.49%
Formula
Percentage change = [(611 - 820) / 820] x 100
Subtract the new number by the original number
611 - 820 = -209
-209 ÷ 820 = -0.2548780487804878
-0.2548780487804878 x 100 = -25.49%