-67.58% is the change from 509 to 165
Calculation steps:
[( 165 - 509 ) ÷ 509] x 100 = -67.58%
Formula
Percentage change = [(165 - 509) / 509] x 100
Subtract the new number by the original number
165 - 509 = -344
-344 ÷ 509 = -0.6758349705304518
-0.6758349705304518 x 100 = -67.58%