Year	Percent
1991	52.661
1992	52.136
1993	52.518
1994	51.044
1995	50.839
1996	50.624
1997	50.26
1998	49.975
1999	50.233
2000	50.866
2001	50.761
2002	49.919
2003	50.829
2004	51.151
2005	48.468
2006	42.996
2007	45.151
2008	51.099
2009	52.743
2010	52.91
2011	53.562
2012	52.736
2013	52.013
2014	51.138
2015	50.786
2016	51.007
2017	50.863
2018	50.823
2019	50.735
2020	50.611
2021	50.472
2022	50.332