27% is the change from 637 to 809
Calculation steps:
[( 809 - 637 ) ÷ 637] x 100 = 27%
Formula
Percentage change = [(809 - 637) / 637] x 100
Subtract the new number by the original number
809 - 637 = 172
172 ÷ 637 = 0.27001569858712715
0.27001569858712715 x 100 = 27%