SQL Ranking Dates to Get Year Over Year Order

SQL Ranking Dates to Get Year Over Year Order

I have a list of dates in a YYYYMM format and I am trying to rank them in
a Year over Year format that would look like the following:
MonthDisplay YearMonth Rank MonthNumber YearNumber
Aug-2013 201308 1 8 2013
Aug-2012 201208 2 8 2012
Jul-2013 201307 3 7 2013
Jul-2012 201207 4 7 2012
I have been able to get it close by using the following Rank and get the
results below:
RANK() OVER(PARTITION BY 1 ORDER BY MonthNumber DESC, YearNumber DESC)
Month YearMonth Rank
Dec-2012 201212 1
Dec-2011 201112 2
Nov-2012 201211 114
Nov-2011 201111 115
Oct-2012 201210 227
Oct-2011 201110 228
However, this starts with Dec-2012 instead of the Aug-2013 (current
month). I can't figure out how to get it to start with the current month.
I am sure it something super easy and I am just missing it. Thanks!