Hi there!
You can also look at the Open Data project. It has a ton of information and includes the breakdown on time lines.
http://www.data.gc.ca/default.asp?lang=En&n=5175A6F0-1&xsl=datacataloguerecord&metaxsl=datacataloguerecord&formid=427337D0-7C36-4FED-8428-C6A63F8C19B3
People who applied in late August and September are starting to get PPR for Americans. Some take longer than others, for various reasons. I've even read a post by a women whose application fell through the cracks. However, I suspect (but have no proof) that the Ottawa timeframe includes the non-American applicants. Occasionally, Ottawa takes on a file for another VO. We have people from the Islamabad and Beirut VOs being processed at Ottawa. I don't know about Beirut, but Islamabad is one of the longest VOs and even if they go through Ottawa, they still take just as long as their original VO... for some reason. My point is, I think that skews the numbers some too.
When you look at the Spreadsheet for Ottawa, keep in mind many people never update their status. If you see someone from January 2011 without PPR/COPR, chances are the user hasn't been back