Systems Created in the last 90 days

Just an exercise with dates because I haven't done much along these lines:

SELECT     DATEPART(week, GETDATE()) - DATEPART(week, Creation_Date0) AS WeeksAgo, COUNT(DATEPART(week, GETDATE()) - DATEPART(week, Creation_Date0))
                      AS Count
FROM         v_R_System
WHERE     (DATEDIFF(dd, Creation_Date0, GETDATE()) < 90)
GROUP BY DATEPART(week, GETDATE()) - DATEPART(week, Creation_Date0)
ORDER BY WeeksAgo

Data looks like the following:

WeeksAgo 0	Count 9
1	143
2	110
3	172
4	100
5	114
6	108
7	104
8	76
9	71
10	78
11	74
12	92
13	21

Then I stuck it in a SRSS chart: