2.5% is the change from 799 to 819
Calculation steps:
[( 819 - 799 ) ÷ 799] x 100 = 2.5%
Formula
Percentage change = [(819 - 799) / 799] x 100
Subtract the new number by the original number
819 - 799 = 20
20 ÷ 799 = 0.025031289111389236
0.025031289111389236 x 100 = 2.5%