Year	Percent
1993	54.89295
1994	54.14764
1995	53.39077
1996	53.61325
1997	54.1496
1998	53.45276
1999	54.5563
2000	54.65753
2001	54.95042
2002	54.25912
2003	52.4974
2004	52.67753
2005	52.17287
2006	51.32403
2007	51.10323
2008	50.33907
2009	51.50223
2010	49.46214
2011	50.33288
2012	51.0647
2013	51.69608
2014	53.07257
2015	54.78675
2016	55.71687
2017	56.31171