You might want to consider using the PIMS Database, sponsored by the Stratagic Planning Institute. It has several advantages:
1. It supplies data by business units, or more specifically, by markets served, as the firms sees them.
2. All data is in ratios, thus avoiding overweighting responses by the biggest firms involved.
3. SIC ocdes are to the 6 digit form (at least the last time I used it).
4. Most data is averaged over a four year period, thus avoiding impacts of short-term trends.
On the other hand, the firms are disguised, and the time periods do not necessarily match.
Also, unless the system has been updated, you must use AQD as the statistical tool, which has some shortcomings that stem from its creator's philosophy.
Take a look.
Tim Edlund, Morgan State University, Baltimore MD 21251
---- Original message ----
>Date: Fri, 11 Mar 2011 15:58:53 +0000
>From: Business Policy and Strategy List <
BPS-NET@AOMLISTS.PACE.EDU> (on behalf of Hemant_Merchant <
merchant@FAU.EDU>)
>Subject: Help needed (Industry data)
>To: <
BPS-NET@AOMLISTS.PACE.EDU>
>
>Dear BPSers:
>I am looking for certain industry-level data, and am hoping that you
>may know more than I do. If you do, please reply DIRECTLY to me
>(
merchant@fau.edu). I shall collate your responses and post them for
>all to benefit.
>
>Specifically, I am interested in indicators of: 1) 4-firm
>concentration ratios, 2) industry growth rates, and 3) industry size.
>Other industry-level data would also be welcome (e.g., R&D
>expenditures, capital expenditures etc.).
>
>It would help if I had information (or even raw data) by all 4-digit
>SIC codes over 1985-2010 period.
>
>--
>
>===============================================================================================
>Hemant Merchant, PhD
>College of Business; Florida Atlantic University
>3200 College Avenue; Davie, FL 33314, USA
>Tel/Fax: 954.236.1631/1298
>
>Author: Competing in Emerging Markets (2008)
>http://www.routledge.com/9780415399500
>===============================================================================================