2.57% is the change from 816 to 837
Calculation steps:
[( 837 - 816 ) ÷ 816] x 100 = 2.57%
Formula
Percentage change = [(837 - 816) / 816] x 100
Subtract the new number by the original number
837 - 816 = 21
21 ÷ 816 = 0.025735294117647058
0.025735294117647058 x 100 = 2.57%