-97.73% is the change from 662 to 15
Calculation steps:
[( 15 - 662 ) ÷ 662] x 100 = -97.73%
Formula
Percentage change = [(15 - 662) / 662] x 100
Subtract the new number by the original number
15 - 662 = -647
-647 ÷ 662 = -0.9773413897280967
-0.9773413897280967 x 100 = -97.73%