9.31% is the change from 870 to 951
Calculation steps:
[( 951 - 870 ) ÷ 870] x 100 = 9.31%
Formula
Percentage change = [(951 - 870) / 870] x 100
Subtract the new number by the original number
951 - 870 = 81
81 ÷ 870 = 0.09310344827586207
0.09310344827586207 x 100 = 9.31%