SQL Query date question

Hello,
I'm searching a query that would display me the number of rows made of a table for the last 4 weeks, grouped by each week.
I basicly have the query but I don't think it will be correct when we go to the next year.
Does anyone know how I can solve this problem?
Select count(*),to_char( create_dt, 'iw' )
from dossiers
where to_char( create_dt, 'iw' ) > to_char(SYSDATE, 'iw') - 4
group by to_char( create_dt, 'iw' )
order by to_char( create_dt, 'iw' ) desc;
Thanks in advance
OLI

This is what I use to count all my audits for the past 4 weeks:
T10> SELECT TRUNC(weeks.start_date) || ' - ' || TRUNC(weeks.start_date + 6) audit_date_span
2       , COUNT(*) count
3    FROM asset_audits,
4         (
5           SELECT NEXT_DAY(
6                    ADD_MONTHS(SYSDATE, -1) - 1
7                  , 'SUNDAY') + ((ROWNUM - 1) * 7) start_date
8             FROM (
9                    SELECT 1
10                      FROM DUAL
11                   CONNECT BY LEVEL < 6
12                  )
13         ) weeks
14   WHERE TRUNC(audit_date) BETWEEN TRUNC(weeks.start_date) AND TRUNC(weeks.start_date + 6)
15   GROUP BY TRUNC(weeks.start_date) || ' - ' || TRUNC(weeks.start_date + 6)
16   ORDER BY TO_DATE(SUBSTR(audit_date_span, 1, 9), 'DD-MON-YY') ASC
17 /
AUDIT_DATE_SPAN                COUNT
29-OCT-2006 - 04-NOV-2006        105
05-NOV-2006 - 11-NOV-2006        201
12-NOV-2006 - 18-NOV-2006        120
19-NOV-2006 - 25-NOV-2006        664
4 rows selected.Cheers.

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