-42.77% is the change from 159 to 91
Calculation steps:
[( 91 - 159 ) ÷ 159] x 100 = -42.77%
Formula
Percentage change = [(91 - 159) / 159] x 100
Subtract the new number by the original number
91 - 159 = -68
-68 ÷ 159 = -0.4276729559748428
-0.4276729559748428 x 100 = -42.77%