-52.36% is the change from 191 to 91
Calculation steps:
[( 91 - 191 ) ÷ 191] x 100 = -52.36%
Formula
Percentage change = [(91 - 191) / 191] x 100
Subtract the new number by the original number
91 - 191 = -100
-100 ÷ 191 = -0.5235602094240838
-0.5235602094240838 x 100 = -52.36%