-3.22% is the change from 621 to 601
Calculation steps:
[( 601 - 621 ) ÷ 621] x 100 = -3.22%
Formula
Percentage change = [(601 - 621) / 621] x 100
Subtract the new number by the original number
601 - 621 = -20
-20 ÷ 621 = -0.0322061191626409
-0.0322061191626409 x 100 = -3.22%
Example