Filtering on the current year in YYYYMM without hardcoding
===

In my report I currently have a prompt box that displays a list of the current year's months in YYYYMM format:
201201
201202
201203...etc

However, I currently have it hardcoded to show between 201201 and 201212. This works fine but I would like to remove the hardcoding for 2012 and use the system date to determine what the current months should be. That way, in January, I won't have to go back and change every instance of 2012 to 2013. 

What would be the best way to accomplish this? I understand to_char(current_date,'YYYYMM') but do not know how to successfully create a filter that would change over in January to display 201301-201312. 

Thanks