-23.25% is the change from 671 to 515
Calculation steps:
[( 515 - 671 ) ÷ 671] x 100 = -23.25%
Formula
Percentage change = [(515 - 671) / 671] x 100
Subtract the new number by the original number
515 - 671 = -156
-156 ÷ 671 = -0.23248882265275708
-0.23248882265275708 x 100 = -23.25%