-22.29% is the change from 646 to 502
Calculation steps:
[( 502 - 646 ) ÷ 646] x 100 = -22.29%
Formula
Percentage change = [(502 - 646) / 646] x 100
Subtract the new number by the original number
502 - 646 = -144
-144 ÷ 646 = -0.22291021671826625
-0.22291021671826625 x 100 = -22.29%