6.87% is the change from 815 to 871
Calculation steps:
[( 871 - 815 ) ÷ 815] x 100 = 6.87%
Formula
Percentage change = [(871 - 815) / 815] x 100
Subtract the new number by the original number
871 - 815 = 56
56 ÷ 815 = 0.0687116564417178
0.0687116564417178 x 100 = 6.87%