Year	Percent
1991	63.352
1992	65.525
1993	65.886
1994	71.856
1995	69.549
1996	74.032
1997	74.593
1998	69.202
1999	72.026
2000	73.393
2001	72.394
2002	73.51
2003	74.1
2004	75
2005	73.132
2006	71.961
2007	72.303
2008	72.701
2009	76.339
2010	79.539
2011	79.954
2012	79.394
2013	79.223
2014	76.924
2015	73.266
2016	71.353
2017	68.25
2018	69.115
2019	69.691
2020	69.963
2021	70.249
2022	70.524