Year	Percent
1991	49.916
1992	49.929
1993	50.409
1994	50.723
1995	50.308
1996	49.567
1997	49.099
1998	48.89
1999	49.21
2000	48.496
2001	53.21
2002	53.155
2003	52.917
2004	51.204
2005	50.239
2006	49.361
2007	49.322
2008	49.387
2009	46.408
2010	46.775
2011	46.518
2012	46.607
2013	46.54
2014	46.026
2015	45.572
2016	45.264
2017	45.166
2018	44.893
2019	44.67
2020	44.434
2021	44.202
2022	43.979