-15.73% is the change from 661 to 557
Calculation steps:
[( 557 - 661 ) ÷ 661] x 100 = -15.73%
Formula
Percentage change = [(557 - 661) / 661] x 100
Subtract the new number by the original number
557 - 661 = -104
-104 ÷ 661 = -0.1573373676248109
-0.1573373676248109 x 100 = -15.73%