-51.7% is the change from 323 to 156
Calculation steps:
[( 156 - 323 ) ÷ 323] x 100 = -51.7%
Formula
Percentage change = [(156 - 323) / 323] x 100
Subtract the new number by the original number
156 - 323 = -167
-167 ÷ 323 = -0.5170278637770898
-0.5170278637770898 x 100 = -51.7%