running total for each employee

I have the following query which works great to return a running total of carpool reimbursements for an individual staff member. (employee earns $30 for each 20 trips, trips roll over until the end of the year).

-- carpool quarter stats
use TRPTracking

declare @employeeID NVarChar(100), @year Char(4)
Set     @employeeID = 'PSmith'
Set     @year = '2014'
------
declare @startDate DateTime, @endDate DateTime
Set     @startDate = '1/1/' + @year
Set     @endDate = DateAdd(d,-1,DateAdd(yyyy,1,@startDate))

DECLARE @calendar TABLE (Date datetime)

WHILE (@startDate <= @endDate) BEGIN
    INSERT INTO @Calendar VALUES (@startDate)
    SET @startDate = DATEADD(quarter, 1, @startDate)
END

DECLARE @CarpoolTbl TABLE (quarter varchar(250), value decimal(18,1), runningTotal decimal(18,1), earned money)
DECLARE @runningTotal decimal(18,1), @earned money
SET @runningTotal = 0
SET @earned = 0

INSERT INTO @CarpoolTbl 
    SELECT CASE DatePart(q, c.date) 
        WHEN 1 THEN 'Jan-Mar' 
        WHEN 2 THEN 'Apr-Jun' 
        WHEN 3 THEN 'Jul-Sep' 
        WHEN 4 THEN 'Oct-Dec' END AS quarter,
        IsNULL(Sum(t.value),0) AS value,
        null,
        0
    FROM @calendar c
    LEFT OUTER JOIN events e ON (DatePart(q, c.date) = DatePart(q, e.eventDate) AND e.employeeID = @employeeID AND e.eventType = 'CP' AND Year(eventDate) = @year)
    LEFT JOIN types t ON t.typeID = e.eventType
    GROUP BY DatePart(q, c.date)

UPDATE @CarpoolTbl 
SET @earned = earned = Floor((@runningTotal + value)/20) - Floor(@runningTotal/20),
    @runningTotal = runningTotal = @runningTotal + value

FROM @CarpoolTbl

SELECT quarter, value, runningTotal, earned * 30 AS earned
FROM @CarpoolTbl

Now, I want a query that returns this information for all employees. I remove the portion that relates to employeeID and I get what looks to be good. But... what is happening is my running total is running for everyone. I need it to restart for each employee. I can't quite figure out where to add the employeeID grouping in the running total.

-- carpool quarter stats
use TRPTracking

declare @year Char(4)
Set     @year = '2014'
------
declare @startDate DateTime, @endDate DateTime
Set     @startDate = '1/1/' + @year
Set     @endDate = DateAdd(d,-1,DateAdd(yyyy,1,@startDate))

DECLARE @calendar TABLE (Date datetime)

WHILE (@startDate <= @endDate) BEGIN
    INSERT INTO @Calendar VALUES (@startDate)
    SET @startDate = DATEADD(quarter, 1, @startDate)
END

DECLARE @CarpoolTbl TABLE (dateQ int, quarter varchar(250), employeeID varchar(255), value decimal(18,1), runningTotal decimal(18,1), earned money)
DECLARE @runningTotal decimal(18,1), @earned money
SET @runningTotal = 0
SET @earned = 0

INSERT INTO @CarpoolTbl 
    SELECT 
        DatePart(q, c.date),
        CASE DatePart(q, c.date) 
            WHEN 1 THEN 'Jan-Mar' 
            WHEN 2 THEN 'Apr-Jun' 
            WHEN 3 THEN 'Jul-Sep' 
            WHEN 4 THEN 'Oct-Dec' END AS quarter,
        e.employeeID,
        IsNULL(Sum(t.value),0) AS value,
        null,
        0
    FROM @calendar c
    LEFT OUTER JOIN events e ON (DatePart(q, c.date) = DatePart(q, e.eventDate) 
    AND e.eventType = 'CP' AND Year(eventDate) = @year)
    LEFT JOIN types t ON t.typeID = e.eventType
    GROUP BY e.employeeID, DatePart(q, c.date)

UPDATE @CarpoolTbl 
SET @earned = earned = Floor((@runningTotal + value)/20) - Floor(@runningTotal/20),
    @runningTotal = runningTotal = @runningTotal + value

FROM @CarpoolTbl

SELECT c.quarter, c.employeeID, a.DisplayName AS employee, c.value AS trips, earned *  30 AS earned
FROM @CarpoolTbl c
LEFT JOIN SBAIntranet.dbo.NTAuth a ON 'SBA\' + c.employeeID = a.AccountName
ORDER BY dateQ, employeeID

Any thoughts?