-12.07% is the change from 638 to 561
Calculation steps:
[( 561 - 638 ) ÷ 638] x 100 = -12.07%
Formula
Percentage change = [(561 - 638) / 638] x 100
Subtract the new number by the original number
561 - 638 = -77
-77 ÷ 638 = -0.1206896551724138
-0.1206896551724138 x 100 = -12.07%