-16.26% is the change from 621 to 520
Calculation steps:
[( 520 - 621 ) ÷ 621] x 100 = -16.26%
Formula
Percentage change = [(520 - 621) / 621] x 100
Subtract the new number by the original number
520 - 621 = -101
-101 ÷ 621 = -0.16264090177133655
-0.16264090177133655 x 100 = -16.26%