Last 3 months values

Hi All,

I have small requirement to derive the last 3 months from the current month.

Can some one help me.I need the  list of values not ranges.

Ex: My current month = 02.2014.(Feb 2014)

Then my put should be below(It excludes the current month).

01.2014

12.2013

11.2013

Regards

Laxman