Source for statistics on the technical writing field

[TechWriter666 <techwriter666 -at- yahoo -dot- com>]

I would like to obtain some good statistics on the following:

Average age of employed technical writers at large corporations.
Length of time technical writers commonly stay in the field.
Average age of new hires at large corporations and whether it has changed since 2000.
Wage declines (or increases) for technical writers at large corporations over, say, the last decade or perhaps since 2000.
Decrease in numbers of technical writers at large corporations since 2000.
Outsourcing of technical writing positions since 2000, including information about the countries to which the jobs are outsourced.
Anyone know what is the best bet for reliable information on such things?
 
Thanks.


      
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