39% is the change from 623 to 866
Calculation steps:
[( 866 - 623 ) ÷ 623] x 100 = 39%
Formula
Percentage change = [(866 - 623) / 623] x 100
Subtract the new number by the original number
866 - 623 = 243
243 ÷ 623 = 0.3900481540930979
0.3900481540930979 x 100 = 39%