Year	Percent
1994	27.45807
1995	28.144
1996	26.89496
1997	24.89754
1998	23.17159
1999	23.18135
2000	24.70746
2001	25.78849
2002	27.1012
2003	29.10586
2004	29.22203
2005	29.10024
2006	28.61449
2007	32.0245
2008	29.40243
2009	24.84508
2010	25.78092
2011	26.46789
2012	26.32091
2013	25.6398
2014	26.55489
2015	24.25803
2016	23.89461
2017	22.49414