Year	Percent
1995	31.2
1996	33.4
1997	34.4
1998	36.8
1999	37.1
2000	30.8
2001	32
2002	29.06
2003	29.4
2004	28.5
2005	30.1
2006	30.5
2007	26.1
2009	26.41
2010	25.98
2011	25.84
2012	24.99
2013	28.31
2016	25.4