-56.95% is the change from 511 to 220
Calculation steps:
[( 220 - 511 ) ÷ 511] x 100 = -56.95%
Formula
Percentage change = [(220 - 511) / 511] x 100
Subtract the new number by the original number
220 - 511 = -291
-291 ÷ 511 = -0.5694716242661448
-0.5694716242661448 x 100 = -56.95%