Year	Percent
1995	51.92223
1996	52.746
1997	52.31557
1998	52.1878
1999	52.95207
2000	53.45803
2001	54.52324
2002	55.97865
2003	55.95557
2004	54.72546
2005	55.52522
2006	56.27328
2007	55.95746
2008	56.59345
2009	56.94972
2010	56.36902
2011	55.69151
2012	54.94471
2013	55.3408
2014	54.58888
2015	53.63095
2016	55.03416
2017	54.85143