-97.47% is the change from 671 to 17
Calculation steps:
[( 17 - 671 ) ÷ 671] x 100 = -97.47%
Formula
Percentage change = [(17 - 671) / 671] x 100
Subtract the new number by the original number
17 - 671 = -654
-654 ÷ 671 = -0.9746646795827124
-0.9746646795827124 x 100 = -97.47%