Can't see Trend Line

Hi all-

First post.

I'm trying to plot a trend line on a range of values that only vary a little bit; however, when scaled, the values are differentiated enough to get a nice "wiggly" plot.

The range varies between .20 and .35 percent.

However, when I generate a plot line, it doesn't show up; it appears in the legend, but not on the graph.

I haven't been really using Excel too long, but have spent a bunch of time on this (and asked a few people) with no luck so far.

Any help greatly appreciated-

Thanks,
Andrew