-60.54% is the change from 811 to 320
Calculation steps:
[( 320 - 811 ) ÷ 811] x 100 = -60.54%
Formula
Percentage change = [(320 - 811) / 811] x 100
Subtract the new number by the original number
320 - 811 = -491
-491 ÷ 811 = -0.6054254007398274
-0.6054254007398274 x 100 = -60.54%