91.35% is the change from 266 to 509
Calculation steps:
[( 509 - 266 ) ÷ 266] x 100 = 91.35%
Formula
Percentage change = [(509 - 266) / 266] x 100
Subtract the new number by the original number
509 - 266 = 243
243 ÷ 266 = 0.9135338345864662
0.9135338345864662 x 100 = 91.35%