Year	Percent
1991	41.746
1992	42.058
1993	42.712
1994	43.67
1995	43.551
1996	43.384
1997	43.652
1998	44.336
1999	45.209
2000	45.535
2001	45.597
2002	46.041
2003	46.303
2004	45.888
2005	46.118
2006	46.308
2007	46.293
2008	45.871
2009	45.752
2010	46.238
2011	45.13
2012	45.186
2013	45.261
2014	45.633
2015	45.762
2016	45.762
2017	45.416
2018	45.074
2019	44.775
2020	44.513
2021	44.28
2022	44.064