-71.12% is the change from 509 to 147
Calculation steps:
[( 147 - 509 ) ÷ 509] x 100 = -71.12%
Formula
Percentage change = [(147 - 509) / 509] x 100
Subtract the new number by the original number
147 - 509 = -362
-362 ÷ 509 = -0.7111984282907662
-0.7111984282907662 x 100 = -71.12%