-43.48% is the change from 161 to 91
Calculation steps:
[( 91 - 161 ) ÷ 161] x 100 = -43.48%
Formula
Percentage change = [(91 - 161) / 161] x 100
Subtract the new number by the original number
91 - 161 = -70
-70 ÷ 161 = -0.43478260869565216
-0.43478260869565216 x 100 = -43.48%