Year	Percent
1995	24.87615
1996	24.2472
1997	23.8221
1998	26.80115
1999	22.88425
2000	23.94698
2001	20.00334
2002	21.66018
2003	23.17667
2004	26.35933
2005	30.82567
2006	32.74781
2007	38.10586
2008	39.2282
2009	23.1419
2010	23.52444
2011	24.1704
2012	23.64435
2013	24.6575
2014	26.06158
2015	22.68368
2016	22.3004
2017	23.27268