Year	Percent
1993	50.58418
1994	50.90448
1995	51.48858
1996	50.34641
1997	51.56247
1998	52.63203
1999	53.50891
2000	54.07925
2001	53.94121
2002	55.5862
2003	56.38746
2004	54.10372
2005	54.08546
2006	54.08227
2007	53.95632
2008	54.58415
2009	55.53768
2010	55.6481
2011	54.6909
2012	54.35315
2013	54.25833
2014	53.6555
2015	53.76662
2016	53.90437
2017	54.23475