68.6% is the change from 344 to 580
Calculation steps:
[( 580 - 344 ) ÷ 344] x 100 = 68.6%
Formula
Percentage change = [(580 - 344) / 344] x 100
Subtract the new number by the original number
580 - 344 = 236
236 ÷ 344 = 0.686046511627907
0.686046511627907 x 100 = 68.6%