-31.06% is the change from 821 to 566
Calculation steps:
[( 566 - 821 ) ÷ 821] x 100 = -31.06%
Formula
Percentage change = [(566 - 821) / 821] x 100
Subtract the new number by the original number
566 - 821 = -255
-255 ÷ 821 = -0.3105968331303289
-0.3105968331303289 x 100 = -31.06%