Access:Average Year to Date in Query

I have a table(Name: "Deliveries", Columns: "Ontime", "Late", "Month", "Year"
When a delivery is ontime it is labled 1, when it is late it is labled 0

The SQL below lists each month, number of deliveries ontime, number deliveries late, as well as the number of average deliveries on-time for each month. How do I add Average year to date to the mix?

Current CODE:
SELECT Deliveries.MonthandYear, Sum(Deliveries.ontime) AS [Delivery On-Time], Format(Avg([ontime]*100),"Fixed") AS [Percent Delivery On-Time for month], Sum(Deliveries.late) AS [Late Deliveries]
FROM Deliveries
GROUP BY Deliveries.MonthandYear, Deliveries.year_thru, Deliveries.month_thru
ORDER BY Deliveries.year_thru, Deliveries.month_thru;

Current Table Looks Like:

Field:              Month                Delivery On-Time   Delivery Late   Percent Delivery On-Time for month
Row1         August 2006                     53                      20                                   72.60            
Row2         September 2006              30                       10                                   75.00
Row3         October 2006                   60                       5                                     92.31
Row4         November 2006               20                       3                                     86.96
Row5         December 2006               15                       1                                     93.75

I NEED THE TABLE TO LOOK LIKE THIS:

Field:              Month    Delivery On-Time   Delivery Late   Percent Delivery On-Time for month      YearToDate
Row1       August 2006           53                      20                                  72.60                                     72.60      
Row2       September 2006     30                       10                                  75.00                                    73.45
Row3         October 2006        60                       5                                    92.31                                   80.34
Row4         November 2006    20                       3                                     86.96                                   81.09
Row5         December 2006    15                       1                                     93.75

ouestqueAsked:
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jerryb30Connect With a Mentor Commented:
OK, fixed formatting.
I had Monthandyear as a text field, hence the datevalue.

SELECT a.monthandyear, Sum(a.ontime) AS [Delivery On-Time], Format([ontime]/([ontime]+[late])*100,"Fixed") AS [Percent Delivery On-Time for month], Sum(a.late) AS [Late Deliveries], Format(DSum("ontime","deliveries","datevalue(monthandyear) <= #" & [a].[monthandyear] & "#")/(DSum("ontime","deliveries","datevalue(monthandyear) <= #" & [a].[monthandyear] & "#")+DSum("late","deliveries","datevalue(monthandyear) <= #" & [a].[monthandyear] & "#"))*100,"Fixed") AS Year_To_Date_On_Time
FROM Deliveries AS a
GROUP BY a.monthandyear, Format([ontime]/([ontime]+[late])*100,"Fixed"), Format(DSum("ontime","deliveries","datevalue(monthandyear) <= #" & [a].[monthandyear] & "#")/(DSum("ontime","deliveries","datevalue(monthandyear) <= #" & [a].[monthandyear] & "#")+DSum("late","deliveries","datevalue(monthandyear) <= #" & [a].[monthandyear] & "#"))*100,"Fixed"), DateValue([monthandyear])
ORDER BY DateValue([monthandyear]);
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jerryb30Commented:
Not sure how you got your sql to work.  Looks like something from another query.
But, try this.
Did not format the percents as you would like them, but
SELECT a.monthandyear, Sum(a.ontime) AS [Delivery On-Time], Format([ontime]/([ontime]+[late])*100,"Fixed") AS [Percent Delivery On-Time for month], Sum(a.late) AS [Late Deliveries], DSum("ontime","deliveries","datevalue(monthandyear) <= #" & [a].[monthandyear] & "#")/(DSum("ontime","deliveries","datevalue(monthandyear) <= #" & [a].[monthandyear] & "#")+DSum("late","deliveries","datevalue(monthandyear) <= #" & [a].[monthandyear] & "#")) AS Year_To_Date_On_Time
FROM Deliveries AS a
GROUP BY a.monthandyear, Format([ontime]/([ontime]+[late])*100,"Fixed"), DSum("ontime","deliveries","datevalue(monthandyear) <= #" & [a].[monthandyear] & "#")/(DSum("ontime","deliveries","datevalue(monthandyear) <= #" & [a].[monthandyear] & "#")+DSum("late","deliveries","datevalue(monthandyear) <= #" & [a].[monthandyear] & "#"));
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ouestqueAuthor Commented:
Awesome Jerry thanks!!!
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ouestqueAuthor Commented:
Increadible. Jerry had just the solution I needed. Thanks again.!
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