Year	Percent
1991	47.178
1992	47.467
1993	46.049
1994	43.927
1995	46.725
1996	50.027
1997	51.268
1998	52.053
1999	53.77
2000	50.343
2001	51.497
2002	52.933
2003	53.591
2004	52.233
2005	53.909
2006	54.119
2007	53.134
2008	55.201
2009	56.949
2010	56.899
2011	56.781
2012	56.107
2013	54.656
2014	55.818
2015	53.973
2016	53.868
2017	53.65
2018	53.556
2019	53.339
2020	53.185
2021	53.044
2022	52.92