PRMIA Quarterly Member Update is not quarterly at all

PRMIA has Quarterly Members Update magazine. What's funny's that it has never been quarterly! Here's the number of issues per year:

2002 - 24 (bi-monthly)
2003 - 15 (monthly-ish)
2004 - 13 (monthly-ish)
2005 - 10 (monthly-ish)
2006 - 11 (monthly-ish)
2007 - 6 (bimonthly)
2008 - 4 (ok, quarterly, at last!)
2009 - 3 (quarterly-ish)
2010 - 1 to date (yearly?)