-19.64% is the change from 331 to 266
Calculation steps:
[( 266 - 331 ) ÷ 331] x 100 = -19.64%
Formula
Percentage change = [(266 - 331) / 331] x 100
Subtract the new number by the original number
266 - 331 = -65
-65 ÷ 331 = -0.19637462235649547
-0.19637462235649547 x 100 = -19.64%