I find the drop-in-advertising rates the most interesting item. I don't follow this closely, is revenue-per-click actually dropping?
As for CPC rates, this link has a nice table showing the increase[0]. Anecdotally I can tell you that my own data corresponds with what they see (across a number of clients/startups I have worked with in past 5-6 years):
[0] http://www.hochmanconsultants.com/articles/je-hochman-benchm...
[1] http://cdn.crowdscience.com/blog/2011/11/online_advertising_...