-97.8% is the change from 683 to 15
Calculation steps:
[( 15 - 683 ) ÷ 683] x 100 = -97.8%
Formula
Percentage change = [(15 - 683) / 683] x 100
Subtract the new number by the original number
15 - 683 = -668
-668 ÷ 683 = -0.9780380673499268
-0.9780380673499268 x 100 = -97.8%