You might find the report for 2011 at the below link useful.
http://www.travel.state.gov/pdf/FY11...Table%20XX.pdf
The column for "immigrants" corresponds to GC cases (includes all EB, FB and immediate relative applications for AOS and CP cases).
Of the 382K grounds of inelligibility
- 313K correspond to 221(g) usually issued for lack of documentation in CP cases
- 26K correspond to unlawful presence in US for more than 1 year
- 15K correspond to Labor certification (not sure but probably only applicable for CP cases)