-63.65% is the change from 509 to 185
Calculation steps:
[( 185 - 509 ) ÷ 509] x 100 = -63.65%
Formula
Percentage change = [(185 - 509) / 509] x 100
Subtract the new number by the original number
185 - 509 = -324
-324 ÷ 509 = -0.6365422396856582
-0.6365422396856582 x 100 = -63.65%