65.86% is the change from 331 to 549
Calculation steps:
[( 549 - 331 ) ÷ 331] x 100 = 65.86%
Formula
Percentage change = [(549 - 331) / 331] x 100
Subtract the new number by the original number
549 - 331 = 218
218 ÷ 331 = 0.6586102719033232
0.6586102719033232 x 100 = 65.86%