-87.33% is the change from 671 to 85
Calculation steps:
[( 85 - 671 ) ÷ 671] x 100 = -87.33%
Formula
Percentage change = [(85 - 671) / 671] x 100
Subtract the new number by the original number
85 - 671 = -586
-586 ÷ 671 = -0.8733233979135618
-0.8733233979135618 x 100 = -87.33%