Enhancement suggestion: Chart on junk percentage

[MKle]

I like the chart on incoming mail, showing all and junk mails.

Equally interesting would be a chart on the development of the junk (and spam) percentage:
I'd like to see if the percentage is going down, and I need to investigate why.

 

[MKle]

Yes, I have created a little script using the API to get the numbers.
But having a chart directly in the UI would be preferrable.