-97.46% is the change from 668 to 17
Calculation steps:
[( 17 - 668 ) ÷ 668] x 100 = -97.46%
Formula
Percentage change = [(17 - 668) / 668] x 100
Subtract the new number by the original number
17 - 668 = -651
-651 ÷ 668 = -0.9745508982035929
-0.9745508982035929 x 100 = -97.46%