-9.09% is the change from 671 to 610
Calculation steps:
[( 610 - 671 ) ÷ 671] x 100 = -9.09%
Formula
Percentage change = [(610 - 671) / 671] x 100
Subtract the new number by the original number
610 - 671 = -61
-61 ÷ 671 = -0.09090909090909091
-0.09090909090909091 x 100 = -9.09%