Year	Percent
1991	46.236
1992	46.404
1993	46.53
1994	46.558
1995	46.399
1996	46.628
1997	46.735
1998	46.697
1999	46.63
2000	46.591
2001	46.695
2002	46.747
2003	46.796
2004	46.834
2005	46.863
2006	47.08
2007	47.204
2008	47.287
2009	47.38
2010	47.39
2011	47.585
2012	47.715
2013	47.772
2014	47.767
2015	47.708
2016	47.693
2017	47.729
2018	47.766
2019	47.812
2020	47.87
2021	47.941
2022	48.024