-19.16% is the change from 621 to 502
Calculation steps:
[( 502 - 621 ) ÷ 621] x 100 = -19.16%
Formula
Percentage change = [(502 - 621) / 621] x 100
Subtract the new number by the original number
502 - 621 = -119
-119 ÷ 621 = -0.19162640901771336
-0.19162640901771336 x 100 = -19.16%