footnote_code	footnote_text
1	Data Not Continuous
2	Non-Economic Events
3	Industry Coding Redefinition
4	Area Redefinition
C	Continuity Break
F	Footnote Exists
p	Preliminary
n	NAICS 2002 replaces SIC beginning March 2003. See http://www.bls.gov/sae/saenaics.htm for details.