Year	Percent
1991	49.588
1992	51.081
1993	55.638
1994	55.071
1995	54.72
1996	56.55
1997	58.516
1998	63.217
1999	64.325
2000	64.243
2001	64.138
2002	63.435
2003	57.726
2004	66.041
2005	60.752
2006	55.768
2007	62.432
2008	61.043
2009	61.974
2010	61.069
2011	61.509
2012	62.87
2013	62.554
2014	62.089
2015	62.568
2016	64.023
2017	63.828
2018	63.613
2019	63.886
2020	64.108
2021	64.275
2022	64.472