31.33% is the change from 166 to 218
Calculation steps:
[( 218 - 166 ) ÷ 166] x 100 = 31.33%
Formula
Percentage change = [(218 - 166) / 166] x 100
Subtract the new number by the original number
218 - 166 = 52
52 ÷ 166 = 0.3132530120481928
0.3132530120481928 x 100 = 31.33%