6.5% is the change from 815 to 868
Calculation steps:
[( 868 - 815 ) ÷ 815] x 100 = 6.5%
Formula
Percentage change = [(868 - 815) / 815] x 100
Subtract the new number by the original number
868 - 815 = 53
53 ÷ 815 = 0.06503067484662577
0.06503067484662577 x 100 = 6.5%