207.14% is the change from 266 to 817
Calculation steps:
[( 817 - 266 ) ÷ 266] x 100 = 207.14%
Formula
Percentage change = [(817 - 266) / 266] x 100
Subtract the new number by the original number
817 - 266 = 551
551 ÷ 266 = 2.0714285714285716
2.0714285714285716 x 100 = 207.14%