-57.76% is the change from 509 to 215
Calculation steps:
[( 215 - 509 ) ÷ 509] x 100 = -57.76%
Formula
Percentage change = [(215 - 509) / 509] x 100
Subtract the new number by the original number
215 - 509 = -294
-294 ÷ 509 = -0.5776031434184676
-0.5776031434184676 x 100 = -57.76%