How to display monthly total count

Question

 Hi To all.

I using Below query to count RuninngTotal its showing below result.

 

select CONVERT(CHAR(4), wf.CreatedDatecount, 100) + CONVERT(CHAR(4), wf.CreatedDatecount, 120) AS MonthYear,

(select COUNT(CONVERT(CHAR(4), CreatedDatecount, 100) + CONVERT(CHAR(4),CreatedDatecount, 120)) from mstr_workforce where

CreatedDatecount<=wf.CreatedDatecount) as RuninngTotal

from mstr_workforce as wf where 1=1 and DATEADD(D, 0, DATEDIFF(D, 0,wf.CreatedDatecount)) Between '01/01/2015' and '12/30/2015' group by wf.CreatedDatecount

 

 

 

MonthYear  RuninngTotal(Total Employee of Register Every month)

Jan 2015     15(Register 15 employees in Jan Month )

Feb 2015    26( New  Register 11 employees in Feb Month )(26=15+11)

Mar 2015    37( New Register 11 employees in Feb Mar )(37=26+11)

Apr 2015    39( New Register 2 employees in Feb Mar )(39=37+2)

May 2015   51( New Register 12 employees in Feb Mar )(51=39+12)

   

this result correct 

 

but i  Want Display  below Like

 

here After may month i am not any  added employees but want display after coming month total employees 51  when i select created between Between '01/01/2015' and '12/30/2015'   

 

MonthYear RuninngTotal(Total Employee of Register Every month)

Jan 2015     15(Register 15 employees in Jan Month )

Feb 2015     26( New Register 11 employees in Feb Month )(26=15+11)

Mar 2015    37( New Register 11 employees in Feb Mar )(37=26+11)

Apr 2015    39( New Register 2 employees in Feb Mar )(39=37+2)

May 2015    51( New Register 12 employees in Feb Mar )(51=39+12)

Jun 2015   51(jun there is no data add in table )

July 2015  51(July there is no data in table )

Aug 2015  51(Aug there is no data in table )

Sep 2015  51(Sep there is no data in table )

Oct 2015  51(Oct there is no data in table )

Nov 2015  51(Nov there is no data in table )

Dec 2015   51(Dec there is no data in table )

 

Please Help me, I struck with that part of work

 

thanks

venkat