2.51% is the change from 836 to 857
Calculation steps:
[( 857 - 836 ) ÷ 836] x 100 = 2.51%
Formula
Percentage change = [(857 - 836) / 836] x 100
Subtract the new number by the original number
857 - 836 = 21
21 ÷ 836 = 0.025119617224880382
0.025119617224880382 x 100 = 2.51%