Year	Percent
1991	53.904
1992	51.324
1993	50.996
1994	51.684
1995	51.794
1996	48.918
1997	49.996
1998	52.471
1999	48.074
2000	53.242
2001	51.095
2002	52.488
2003	48.032
2004	50.97
2005	52.411
2006	54.768
2007	54.904
2008	53.364
2009	53.614
2010	52.104
2011	50.318
2012	50.836
2013	48.927
2014	49.244
2015	50.945
2016	51.298
2017	51.714
2018	51.088
2019	50.451
2020	49.787
2021	49.111
2022	48.409