About 32 months ago I posted Creative Commons licenses on Flickr: many more images, slightly more freedom. Since then the rate of growth and change in license composition appears to have remained about the same. I haven’t looked past the graphs. You can download my updated spreadsheet. The old post has explanations and links to raw data.
I was reminded to look again by a mailing list discussion tangentially related to the ongoing development of version 4.0 CC licenses.