-71.32% is the change from 509 to 146
Calculation steps:
[( 146 - 509 ) ÷ 509] x 100 = -71.32%
Formula
Percentage change = [(146 - 509) / 509] x 100
Subtract the new number by the original number
146 - 509 = -363
-363 ÷ 509 = -0.7131630648330058
-0.7131630648330058 x 100 = -71.32%