I don't doubt what you say, but I'm curious about the context for saying "usually parliaments get prorogued about every two years or so." I recall that when Harper first prorogued parliament a few years ago, various journalists had to go look it up, and I recall somebody saying it hadn't been done since the 1930s.

It's entirely possible that (a) he or she was wrong, or (b) the manner of the proroguation was special: that is, parliament might be prorogued as a matter of course under some circumstances, and those circumstances did not obtain, so Harper doing so was unusual.

It's an area where my ignorance is vast, and even my ignorance of my ignorance is vast.