-33.9% is the change from 236 to 156
Calculation steps:
[( 156 - 236 ) ÷ 236] x 100 = -33.9%
Formula
Percentage change = [(156 - 236) / 236] x 100
Subtract the new number by the original number
156 - 236 = -80
-80 ÷ 236 = -0.3389830508474576
-0.3389830508474576 x 100 = -33.9%