2.51% is the change from 835 to 856
Calculation steps:
[( 856 - 835 ) ÷ 835] x 100 = 2.51%
Formula
Percentage change = [(856 - 835) / 835] x 100
Subtract the new number by the original number
856 - 835 = 21
21 ÷ 835 = 0.025149700598802394
0.025149700598802394 x 100 = 2.51%