Exponential Best Fit Line

I am trying to do a line of best fit with some charts and on some charts, it isn't giving me the option to have my line of best fit be exponential. The closest thing I could get to it was polynomial. Does anyone know why this would be or how I can fix it?

Thanks,
Will

I don't do charts much, but in Excel 2004, the help system has something about exponential Trendlines. Perhaps that may help. What version are you using?

Ah, I think that was my problem. Much appreciated shg!

You're welcome