-8.96% is the change from 670 to 610
Calculation steps:
[( 610 - 670 ) ÷ 670] x 100 = -8.96%
Formula
Percentage change = [(610 - 670) / 670] x 100
Subtract the new number by the original number
610 - 670 = -60
-60 ÷ 670 = -0.08955223880597014
-0.08955223880597014 x 100 = -8.96%