-12.26% is the change from 155 to 136
Calculation steps:
[( 136 - 155 ) ÷ 155] x 100 = -12.26%
Formula
Percentage change = [(136 - 155) / 155] x 100
Subtract the new number by the original number
136 - 155 = -19
-19 ÷ 155 = -0.12258064516129032
-0.12258064516129032 x 100 = -12.26%