-97.82% is the change from 687 to 15
Calculation steps:
[( 15 - 687 ) ÷ 687] x 100 = -97.82%
Formula
Percentage change = [(15 - 687) / 687] x 100
Subtract the new number by the original number
15 - 687 = -672
-672 ÷ 687 = -0.9781659388646288
-0.9781659388646288 x 100 = -97.82%