-98.51% is the change from 671 to 10
Calculation steps:
[( 10 - 671 ) ÷ 671] x 100 = -98.51%
Formula
Percentage change = [(10 - 671) / 671] x 100
Subtract the new number by the original number
10 - 671 = -661
-661 ÷ 671 = -0.9850968703427719
-0.9850968703427719 x 100 = -98.51%