-21.74% is the change from 621 to 486
Calculation steps:
[( 486 - 621 ) ÷ 621] x 100 = -21.74%
Formula
Percentage change = [(486 - 621) / 621] x 100
Subtract the new number by the original number
486 - 621 = -135
-135 ÷ 621 = -0.21739130434782608
-0.21739130434782608 x 100 = -21.74%