4.21% is the change from 951 to 991
Calculation steps:
[( 991 - 951 ) ÷ 951] x 100 = 4.21%
Formula
Percentage change = [(991 - 951) / 951] x 100
Subtract the new number by the original number
991 - 951 = 40
40 ÷ 951 = 0.04206098843322818
0.04206098843322818 x 100 = 4.21%