2.35% is the change from 851 to 871
Calculation steps:
[( 871 - 851 ) ÷ 851] x 100 = 2.35%
Formula
Percentage change = [(871 - 851) / 851] x 100
Subtract the new number by the original number
871 - 851 = 20
20 ÷ 851 = 0.023501762632197415
0.023501762632197415 x 100 = 2.35%