I don't think that trend is right... -1050.41%

Yeah, that is def not correct. If you add the trendline to the graph, you will see that the trend goes into the negative, so it seems that the trend goes from 35 to -3, which should be a percent change of about -108. So its off by a factor of 10, I'll check it out and see what the problem is. -Dustin

How do I add a trend line?

In the customize view (click 'customize' on the right). Then in the graph key click 'Show Advanced Options'. You can then click the checkbox next to 'Add Trend Line'.