-98.96% is the change from 671 to 7
Calculation steps:
[( 7 - 671 ) ÷ 671] x 100 = -98.96%
Formula
Percentage change = [(7 - 671) / 671] x 100
Subtract the new number by the original number
7 - 671 = -664
-664 ÷ 671 = -0.9895678092399404
-0.9895678092399404 x 100 = -98.96%