Year	Percent
1991	50.832
1992	50.972
1993	51.77
1994	51.21
1995	51.61
1996	52.745
1997	54.5
1998	54.45
1999	56.981
2000	55.772
2001	57.794
2002	59.472
2003	59.596
2004	58.748
2005	58.607
2006	56.391
2007	56.321
2008	56.545
2009	53.983
2010	55.036
2011	56.25
2012	57.386
2013	59.801
2014	59.314
2015	55.589
2016	56.359
2017	55.909
2018	55.468
2019	55.478
2020	55.612
2021	55.912
2022	56.089