Year	Percent
1991	44.051
1992	44.009
1993	44.408
1994	44.827
1995	45.723
1996	45.749
1997	45.754
1998	45.789
1999	45.825
2000	45.871
2001	45.911
2002	45.963
2003	46.011
2004	46.048
2005	46.084
2006	46.122
2007	46.157
2008	46.186
2009	46.21
2010	46.236
2011	46.262
2012	46.256
2013	46.284
2014	46.325
2015	46.385
2016	46.443
2017	46.499
2018	46.566
2019	46.645
2020	46.838
2021	47.027
2022	47.225