Year	Percent
1991	53.314
1992	51.605
1993	57.316
1994	51.183
1995	53.321
1996	55.007
1997	54.034
1998	52.737
1999	55.156
2000	59.275
2001	60.095
2002	60.935
2003	61.638
2004	62.033
2005	63.51
2006	63.685
2007	64.782
2008	67.117
2009	65.207
2010	64.99
2011	65.046
2012	65.757
2013	66.563
2014	72.476
2015	72.987
2016	72.747
2017	72.522
2018	72.723
2019	72.993
2020	73.4
2021	73.664
2022	74.219