-70.33% is the change from 509 to 151
Calculation steps:
[( 151 - 509 ) ÷ 509] x 100 = -70.33%
Formula
Percentage change = [(151 - 509) / 509] x 100
Subtract the new number by the original number
151 - 509 = -358
-358 ÷ 509 = -0.7033398821218074
-0.7033398821218074 x 100 = -70.33%