There are about 40 datasets of 2007 data have been published. However, not all of them are available on SITC Rev.3 due to not-yet-available conversion tables between HS2007 and SITC Rev.3.

You should try to reach your goal using other classification, such as combining SITC Rev.3 and SITC Rev.4

Update:

As of July 2007, 2007 data is also available in SITC Rev.3 Classification

markie:

There are about 40 datasets of 2007 data have been published. However, not all of them are available on SITC Rev.3 due to not-yet-available conversion tables between HS2007 and SITC Rev.3.

You should try to reach your goal using other classification, such as combining SITC Rev.3 and SITC Rev.4

Is this the link you use to tell us what is available?

http://comtrade.un.org/db/mr/daYearsResults.aspx

Also, I think this is a link that tells us the most recent data uploads. I'm trying to get a sense of when 2006 data was completely uploaded (% of countries uploaded as a function of time for a given classification) and I think this is where I should look.

I put up a snapshot of availaibility by classification and year in an excel (xls) file. Please take a look and let me know if it is helpful.

 posted it here: 

 http://opensourceeconomics.wordpress.com/2008/09/26/comtrade-some-usage-notes-from-uc-berkeley/

(see the link to SEPT26)

Looks like some classifications have less country coverage. 

Construction of this file proceeded with these steps:

1) import data into excel

2) get rid of extraneous columns

3) convert text to columns (comma separated)

4) used counta( ) function to get a count of countries.