-97.5% is the change from 679 to 17
Calculation steps:
[( 17 - 679 ) ÷ 679] x 100 = -97.5%
Formula
Percentage change = [(17 - 679) / 679] x 100
Subtract the new number by the original number
17 - 679 = -662
-662 ÷ 679 = -0.9749631811487481
-0.9749631811487481 x 100 = -97.5%