-66.8% is the change from 509 to 169
Calculation steps:
[( 169 - 509 ) ÷ 509] x 100 = -66.8%
Formula
Percentage change = [(169 - 509) / 509] x 100
Subtract the new number by the original number
169 - 509 = -340
-340 ÷ 509 = -0.6679764243614931
-0.6679764243614931 x 100 = -66.8%