2.15% is the change from 931 to 951
Calculation steps:
[( 951 - 931 ) ÷ 931] x 100 = 2.15%
Formula
Percentage change = [(951 - 931) / 931] x 100
Subtract the new number by the original number
951 - 931 = 20
20 ÷ 931 = 0.021482277121374866
0.021482277121374866 x 100 = 2.15%