-97.71% is the change from 654 to 15
Calculation steps:
[( 15 - 654 ) ÷ 654] x 100 = -97.71%
Formula
Percentage change = [(15 - 654) / 654] x 100
Subtract the new number by the original number
15 - 654 = -639
-639 ÷ 654 = -0.9770642201834863
-0.9770642201834863 x 100 = -97.71%