Year	Percent of total labor force (Units)
1997	16.761
1998	12.405
1999	13.462
2000	13.483
2001	8.171
2002	11.672
2003	10.781
2004	12.288
2005	8.089
2006	8.182
2007	8.406
2008	10.924
2009	8.139
2010	8.613