-5.48% is the change from 657 to 621
Calculation steps:
[( 621 - 657 ) ÷ 657] x 100 = -5.48%
Formula
Percentage change = [(621 - 657) / 657] x 100
Subtract the new number by the original number
621 - 657 = -36
-36 ÷ 657 = -0.0547945205479452
-0.0547945205479452 x 100 = -5.48%