-57.77% is the change from 521 to 220
Calculation steps:
[( 220 - 521 ) ÷ 521] x 100 = -57.77%
Formula
Percentage change = [(220 - 521) / 521] x 100
Subtract the new number by the original number
220 - 521 = -301
-301 ÷ 521 = -0.5777351247600768
-0.5777351247600768 x 100 = -57.77%