Year	Percent
1998	40.76146
1999	41.25275
2001	31.95847
2002	44.11164
2003	41.29405
2004	38.46132
2005	38.96508
2006	36.75242
2007	38.33511
2008	39.32854
2009	44.08719
2010	41.7454
2011	37.25928
2012	38.39882
2013	38.89616
2014	41.25811