-18.68% is the change from 621 to 505
Calculation steps:
[( 505 - 621 ) ÷ 621] x 100 = -18.68%
Formula
Percentage change = [(505 - 621) / 621] x 100
Subtract the new number by the original number
505 - 621 = -116
-116 ÷ 621 = -0.18679549114331723
-0.18679549114331723 x 100 = -18.68%