Year	Percent
1995	51.70004
1996	51.4348
1997	54.55092
1998	53.88906
1999	55.2865
2000	53.15682
2001	54.55489
2002	55.06598
2003	54.18606
2004	53.45382
2005	53.47883
2006	52.09495
2007	52.37457
2008	52.56452
2009	56.85109
2010	56.26776
2011	55.36016
2012	55.80018
2013	57.31273
2014	55.20309
2015	55.72076
2016	55.637
2017	55.94308