-3.06% is the change from 621 to 602
Calculation steps:
[( 602 - 621 ) ÷ 621] x 100 = -3.06%
Formula
Percentage change = [(602 - 621) / 621] x 100
Subtract the new number by the original number
602 - 621 = -19
-19 ÷ 621 = -0.030595813204508857
-0.030595813204508857 x 100 = -3.06%