-97.78% is the change from 676 to 15
Calculation steps:
[( 15 - 676 ) ÷ 676] x 100 = -97.78%
Formula
Percentage change = [(15 - 676) / 676] x 100
Subtract the new number by the original number
15 - 676 = -661
-661 ÷ 676 = -0.977810650887574
-0.977810650887574 x 100 = -97.78%