-56.78% is the change from 509 to 220
Calculation steps:
[( 220 - 509 ) ÷ 509] x 100 = -56.78%
Formula
Percentage change = [(220 - 509) / 509] x 100
Subtract the new number by the original number
220 - 509 = -289
-289 ÷ 509 = -0.5677799607072691
-0.5677799607072691 x 100 = -56.78%
Example