-35.76% is the change from 811 to 521
Calculation steps:
[( 521 - 811 ) ÷ 811] x 100 = -35.76%
Formula
Percentage change = [(521 - 811) / 811] x 100
Subtract the new number by the original number
521 - 811 = -290
-290 ÷ 811 = -0.35758323057953145
-0.35758323057953145 x 100 = -35.76%