-30.13% is the change from 156 to 109
Calculation steps:
[( 109 - 156 ) ÷ 156] x 100 = -30.13%
Formula
Percentage change = [(109 - 156) / 156] x 100
Subtract the new number by the original number
109 - 156 = -47
-47 ÷ 156 = -0.30128205128205127
-0.30128205128205127 x 100 = -30.13%