6.26% is the change from 815 to 866
Calculation steps:
[( 866 - 815 ) ÷ 815] x 100 = 6.26%
Formula
Percentage change = [(866 - 815) / 815] x 100
Subtract the new number by the original number
866 - 815 = 51
51 ÷ 815 = 0.06257668711656442
0.06257668711656442 x 100 = 6.26%