-51.96% is the change from 331 to 159
Calculation steps:
[( 159 - 331 ) ÷ 331] x 100 = -51.96%
Formula
Percentage change = [(159 - 331) / 331] x 100
Subtract the new number by the original number
159 - 331 = -172
-172 ÷ 331 = -0.5196374622356495
-0.5196374622356495 x 100 = -51.96%