-49.72% is the change from 181 to 91
Calculation steps:
[( 91 - 181 ) ÷ 181] x 100 = -49.72%
Formula
Percentage change = [(91 - 181) / 181] x 100
Subtract the new number by the original number
91 - 181 = -90
-90 ÷ 181 = -0.4972375690607735
-0.4972375690607735 x 100 = -49.72%