-59.02% is the change from 510 to 209
Calculation steps:
[( 209 - 510 ) ÷ 510] x 100 = -59.02%
Formula
Percentage change = [(209 - 510) / 510] x 100
Subtract the new number by the original number
209 - 510 = -301
-301 ÷ 510 = -0.5901960784313726
-0.5901960784313726 x 100 = -59.02%