-11.54% is the change from 156 to 138
Calculation steps:
[( 138 - 156 ) ÷ 156] x 100 = -11.54%
Formula
Percentage change = [(138 - 156) / 156] x 100
Subtract the new number by the original number
138 - 156 = -18
-18 ÷ 156 = -0.11538461538461539
-0.11538461538461539 x 100 = -11.54%