-13.56% is the change from 671 to 580
Calculation steps:
[( 580 - 671 ) ÷ 671] x 100 = -13.56%
Formula
Percentage change = [(580 - 671) / 671] x 100
Subtract the new number by the original number
580 - 671 = -91
-91 ÷ 671 = -0.13561847988077497
-0.13561847988077497 x 100 = -13.56%