-59.1% is the change from 511 to 209
Calculation steps:
[( 209 - 511 ) ÷ 511] x 100 = -59.1%
Formula
Percentage change = [(209 - 511) / 511] x 100
Subtract the new number by the original number
209 - 511 = -302
-302 ÷ 511 = -0.5909980430528375
-0.5909980430528375 x 100 = -59.1%