-8.05% is the change from 621 to 571
Calculation steps:
[( 571 - 621 ) ÷ 621] x 100 = -8.05%
Formula
Percentage change = [(571 - 621) / 621] x 100
Subtract the new number by the original number
571 - 621 = -50
-50 ÷ 621 = -0.08051529790660225
-0.08051529790660225 x 100 = -8.05%