-90.8% is the change from 163 to 15
Calculation steps:
[( 15 - 163 ) ÷ 163] x 100 = -90.8%
Formula
Percentage change = [(15 - 163) / 163] x 100
Subtract the new number by the original number
15 - 163 = -148
-148 ÷ 163 = -0.9079754601226994
-0.9079754601226994 x 100 = -90.8%