how to get the year in date parameter

Hi Guys,
I have a parameter in my SSRS report and a variable that contains the following codes.
i already get the month but my problem is how to get the year. speciall if it falls on the previous year.
like the example below when i run the report my start  month is May and the year is 2012 but when the month falls now on 
Dec the year should be 2011. how sould i work on this. need your help guys. thanks.
Declare @Startdate datetime
Set @Startdate='2012/05/09'
=MonthName(Month(DateAdd("M",0,Parameters!StartDate.Value)))&"-"&??   --value is May-2012
=MonthName(Month(DateAdd("M",-1,Parameters!StartDate.Value)))&"-"&??  --value is April-2012
=MonthName(Month(DateAdd("M",-2,Parameters!StartDate.Value)))&"-"&??  --value is March-2012
=MonthName(Month(DateAdd("M",-3,Parameters!StartDate.Value)))&"-"&??  --value is Feb-2012
=MonthName(Month(DateAdd("M",-4,Parameters!StartDate.Value)))&"-"&??  --value is Jan-2012
=MonthName(Month(DateAdd("M",-5,Parameters!StartDate.Value)))&"-"&??   --value is Dec-2011