-13.64% is the change from 645 to 557
Calculation steps:
[( 557 - 645 ) ÷ 645] x 100 = -13.64%
Formula
Percentage change = [(557 - 645) / 645] x 100
Subtract the new number by the original number
557 - 645 = -88
-88 ÷ 645 = -0.13643410852713178
-0.13643410852713178 x 100 = -13.64%