-34.74% is the change from 331 to 216
Calculation steps:
[( 216 - 331 ) ÷ 331] x 100 = -34.74%
Formula
Percentage change = [(216 - 331) / 331] x 100
Subtract the new number by the original number
216 - 331 = -115
-115 ÷ 331 = -0.3474320241691843
-0.3474320241691843 x 100 = -34.74%