-30.9% is the change from 233 to 161
Calculation steps:
[( 161 - 233 ) ÷ 233] x 100 = -30.9%
Formula
Percentage change = [(161 - 233) / 233] x 100
Subtract the new number by the original number
161 - 233 = -72
-72 ÷ 233 = -0.3090128755364807
-0.3090128755364807 x 100 = -30.9%