-16.87% is the change from 670 to 557
Calculation steps:
[( 557 - 670 ) ÷ 670] x 100 = -16.87%
Formula
Percentage change = [(557 - 670) / 670] x 100
Subtract the new number by the original number
557 - 670 = -113
-113 ÷ 670 = -0.16865671641791044
-0.16865671641791044 x 100 = -16.87%