how to get a running total in SQL

Hi Guys,

I want to get a running total. But its a bit tricky. I have data depending on ID, YEAR, Month, Value like the following.

ID, Year, Month, Value

36002084 2014 Jan 8391
36002084 2014 Jan 0
36002084 2014 Jan 3440
36002084 2014 Jan 0
36002084 2014 Jan 548
36002084 2014 Jan 109
36002084 2014 Jan 125

I wrote the Query below

select
[UEP ID],[Year],[Month],sum([Total VtM EUR]) 'Running Total'

from
 RegData

where
 [UEP ID]=36002084 and [Year]=2014
group by [UEP ID],[Year],[Month]

I got this output

36002084 2014 Apr 887620
36002084 2014 Aug 789440
36002084 2014 Dec 528453
36002084 2014 Feb 606627
36002084 2014 Jan 331613
36002084 2014 Jul 681314
36002084 2014 Jun 330384
36002084 2014 Mar 1044301
36002084 2014 May 671818
36002084 2014 Nov 465576
36002084 2014 Oct 590147
36002084 2014 Sep 527861

Now I need to get a output like this,

36002084 2014 Jan 331613
36002084 2014 Feb 938240

A running total depending on the ID, Year and Month. Although I showed this for two steps I need to get it from one query.

Question is - To get a running total based on ID, Year, Month. If I do the normal group by and sum query I could get it for all the months for each id. But need to then add January value to February and updated February value

Please help me on this.

Thanks

Lucki