15.4% is the change from 831 to 959
Calculation steps:
[( 959 - 831 ) ÷ 831] x 100 = 15.4%
Formula
Percentage change = [(959 - 831) / 831] x 100
Subtract the new number by the original number
959 - 831 = 128
128 ÷ 831 = 0.15403128760529483
0.15403128760529483 x 100 = 15.4%