-97.7% is the change from 653 to 15
Calculation steps:
[( 15 - 653 ) ÷ 653] x 100 = -97.7%
Formula
Percentage change = [(15 - 653) / 653] x 100
Subtract the new number by the original number
15 - 653 = -638
-638 ÷ 653 = -0.9770290964777948
-0.9770290964777948 x 100 = -97.7%