-97.46% is the change from 670 to 17
Calculation steps:
[( 17 - 670 ) ÷ 670] x 100 = -97.46%
Formula
Percentage change = [(17 - 670) / 670] x 100
Subtract the new number by the original number
17 - 670 = -653
-653 ÷ 670 = -0.9746268656716418
-0.9746268656716418 x 100 = -97.46%