I have imported the data fram Excel and it comes like this:
Calendar Year/Month 01.2008 01.2008 01.2008 01.2008 01.2008 02.2008 02.2008
Calendar year / week 01.2008 02.2008 03.2008 04.2008 05.2008 05.2008 06.2008
There are repeats in the weeks both belonging to two months. It's the same
at the end of the year.
So, I think it was to do with the data acquisition, probably, and how it is
saved in the database.
Thanks for your help and interest.
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