87.35% is the change from 166 to 311
Calculation steps:
[( 311 - 166 ) ÷ 166] x 100 = 87.35%
Formula
Percentage change = [(311 - 166) / 166] x 100
Subtract the new number by the original number
311 - 166 = 145
145 ÷ 166 = 0.8734939759036144
0.8734939759036144 x 100 = 87.35%