6.39% is the change from 814 to 866
Calculation steps:
[( 866 - 814 ) ÷ 814] x 100 = 6.39%
Formula
Percentage change = [(866 - 814) / 814] x 100
Subtract the new number by the original number
866 - 814 = 52
52 ÷ 814 = 0.06388206388206388
0.06388206388206388 x 100 = 6.39%