I didn't realize until recently that RN kept track of a couple years' worth of dines. Finally got around to compiling them so will add my numbers to the record (including subset of bonus miles):

2013 = 12,722 (bonuses = 6,260)
2012 = 7,256 (bonuses = 1,650)
2011 = 14,471 (bonuses = 5,815)
2010 = 19,701 (bonuses = 9,579)

I joined in 2009 but couldn't find any records. Probably 5-6k including sign-up bonus. 2014 is off to a good start with 7,176 miles earned as of 3/28.

I dine out regularly, especially when traveling, and have always tried to find affiliated restaurants nearby. I credit to UA and am happy to see I've earned the equivalent of a coach fare to Europe in the process.