5.86% is the change from 870 to 921
Calculation steps:
[( 921 - 870 ) ÷ 870] x 100 = 5.86%
Formula
Percentage change = [(921 - 870) / 870] x 100
Subtract the new number by the original number
921 - 870 = 51
51 ÷ 870 = 0.05862068965517241
0.05862068965517241 x 100 = 5.86%