I second(++) this request. The custom graphs are pretty good but the lack of yearly statistics really hurt.
I think the issue is really the interface, as it doesn't lend itself to yearly Data "types" well. For example, there are a mix of "periods" in the Series selection. The Series/Drawing selection panel should have another pull down for Period. Depending on what Series is requested then the available Periods should change. And visa versa, depending on what Period is requested then the available Series should change. I cannot see how these can be independent of each other. This will also simplify the Data Type pull down.
With a better way of "filtering" choices then hourly, daily, weekly, monthly, and yearly periods can be easily supported. And extended.
Anyway, that's my take on the custom graphs.