6.62% is the change from 816 to 870
Calculation steps:
[( 870 - 816 ) ÷ 816] x 100 = 6.62%
Formula
Percentage change = [(870 - 816) / 816] x 100
Subtract the new number by the original number
870 - 816 = 54
54 ÷ 816 = 0.0661764705882353
0.0661764705882353 x 100 = 6.62%