-1.49% is the change from 671 to 661
Calculation steps:
[( 661 - 671 ) ÷ 671] x 100 = -1.49%
Formula
Percentage change = [(661 - 671) / 671] x 100
Subtract the new number by the original number
661 - 671 = -10
-10 ÷ 671 = -0.014903129657228018
-0.014903129657228018 x 100 = -1.49%