Confidence Level -- Graph View

It's nice to have both table and graph view in the reports for an activity. However, I would love to see a trend chart for Confidence. There is no easy way to see how Confidence bounces around over the course of a test.

I'd like to get a sense of the volatility of the Confidence estimate. The only way to see the history of Confidence is by adjusting the date range. Is there another way to do this?