-97.77% is the change from 672 to 15
Calculation steps:
[( 15 - 672 ) ÷ 672] x 100 = -97.77%
Formula
Percentage change = [(15 - 672) / 672] x 100
Subtract the new number by the original number
15 - 672 = -657
-657 ÷ 672 = -0.9776785714285714
-0.9776785714285714 x 100 = -97.77%