What is this?
This website indexes all available LCAs from 2001 to 2015.
Where does the information come from?
LCAs are public records and provided by the "Office of Foreign Labor Certification".
IMHO, this is misleading. LCAs don't have a 1-1 corelation to 'Green Cards'. This data is based on the PERM process which is just 1 stage in the green card process. LCAs aren't green card applications, but a labour market test based on which green cards are applied for.