I re-ran some of our analysis scripts from the "Do You See What I See?" paper to bring the graphs up to the present day. In the paper, our OONI-derived data only went up to August 2015, but now it's update to the present. Take a look at this graph, which shows the rate of Tor blocking over time (it's an updated version of Figure 7):

https://people.torproject.org/~dcf/graphs/ooni-tor-blocker-rate-20160323.png

The interesting characteristic is CloudFlare: after suddenly decreasing from 3% to 1% in June 2015, and slowly decreasing over the course of months to almost 0%, CloudFlare's blocking rate in the OONI data set suddenly increased to about 4% in December 2015. This is consistent with my own experience, that CloudFlare was pretty easy for a while, but lately it's much harder.

These percentages are out of all HTTP requests issued by ooniprobe, and only count cases where the Tor request was blocked but the non-Tor request was not blocked. There could also be other confounding factors that we haven't investigated, like maybe OONI's URL list or probe distribution changed suddenly. If you would like to dig deeper, here is the source code that generates the graph:

git clone https://www.bamsoftware.com/git/ooni-tor-blocks.git

The findblocks.csv file in the source contains a summary of each HTTP request pair issued by ooniprobe, distilled from the raw reports.