Year	Percent
1991	46.273
1992	46.307
1993	46.599
1994	45.595
1995	45.88
1996	45.751
1997	45.236
1998	44.942
1999	45.159
2000	44.562
2001	45.594
2002	46.756
2003	46.535
2004	46.481
2005	46.169
2006	45.332
2007	45.108
2008	44.761
2009	44.996
2010	45.365
2011	45.44
2012	45.325
2013	45.189
2014	45.083
2015	45.511
2016	45.14
2017	45.044
2018	45.04
2019	45.025
2020	44.913
2021	44.594
2022	44.214