-42.04% is the change from 157 to 91
Calculation steps:
[( 91 - 157 ) ÷ 157] x 100 = -42.04%
Formula
Percentage change = [(91 - 157) / 157] x 100
Subtract the new number by the original number
91 - 157 = -66
-66 ÷ 157 = -0.42038216560509556
-0.42038216560509556 x 100 = -42.04%