Year	Percent
1991	47.343
1992	47.923
1993	47.82
1994	44.267
1995	45.265
1996	43.362
1997	45.625
1998	44.99
1999	45.836
2000	43.157
2001	44.638
2002	44.322
2003	44.08
2004	43.663
2005	43.587
2006	45.656
2007	47.607
2008	48.314
2009	46.932
2010	45.924
2011	45.032
2012	45.571
2013	44.934
2014	45.975
2015	45.511
2016	45.292
2017	46.573
2018	46.308
2019	46.001
2020	45.677
2021	45.361
2022	45.056