-21.1% is the change from 621 to 490
Calculation steps:
[( 490 - 621 ) ÷ 621] x 100 = -21.1%
Formula
Percentage change = [(490 - 621) / 621] x 100
Subtract the new number by the original number
490 - 621 = -131
-131 ÷ 621 = -0.2109500805152979
-0.2109500805152979 x 100 = -21.1%