-99.25% is the change from 671 to 5
Calculation steps:
[( 5 - 671 ) ÷ 671] x 100 = -99.25%
Formula
Percentage change = [(5 - 671) / 671] x 100
Subtract the new number by the original number
5 - 671 = -666
-666 ÷ 671 = -0.992548435171386
-0.992548435171386 x 100 = -99.25%