-18.32% is the change from 191 to 156
Calculation steps:
[( 156 - 191 ) ÷ 191] x 100 = -18.32%
Formula
Percentage change = [(156 - 191) / 191] x 100
Subtract the new number by the original number
156 - 191 = -35
-35 ÷ 191 = -0.18324607329842932
-0.18324607329842932 x 100 = -18.32%