-23.55% is the change from 811 to 620
Calculation steps:
[( 620 - 811 ) ÷ 811] x 100 = -23.55%
Formula
Percentage change = [(620 - 811) / 811] x 100
Subtract the new number by the original number
620 - 811 = -191
-191 ÷ 811 = -0.23551171393341552
-0.23551171393341552 x 100 = -23.55%