-98.39% is the change from 930 to 15
Calculation steps:
[( 15 - 930 ) ÷ 930] x 100 = -98.39%
Formula
Percentage change = [(15 - 930) / 930] x 100
Subtract the new number by the original number
15 - 930 = -915
-915 ÷ 930 = -0.9838709677419355
-0.9838709677419355 x 100 = -98.39%