Analysis :: MDX Multiple Years On Columns

Using 'TAIL([Time].[Time].[Year].MEMBERS,1)' I can get the current year dynamically.  My question is how do I get the previous two years dynamically as well.  I've tried a few different ways with no luck.  As you can see below I'd like to replace 2014 and 2013 with current year -1 and current year -2.

SELECT
{
[Time].[Time].[Year].&[2013],
[Time].[Time].[Year].&[2014],
TAIL([Time].[Time].[Year].MEMBERS,1)
}ON COLUMNS,
NON EMPTY
{[Branches].[Branches].[Region]*[Measures].[Ship Resale S&D Run Rate]} ON ROWS
FROM SALES