-72.1% is the change from 509 to 142
Calculation steps:
[( 142 - 509 ) ÷ 509] x 100 = -72.1%
Formula
Percentage change = [(142 - 509) / 509] x 100
Subtract the new number by the original number
142 - 509 = -367
-367 ÷ 509 = -0.7210216110019646
-0.7210216110019646 x 100 = -72.1%