19.39% is the change from 815 to 973
Calculation steps:
[( 973 - 815 ) ÷ 815] x 100 = 19.39%
Formula
Percentage change = [(973 - 815) / 815] x 100
Subtract the new number by the original number
973 - 815 = 158
158 ÷ 815 = 0.19386503067484662
0.19386503067484662 x 100 = 19.39%