Year	Percent
1991	42.38
1992	42.361
1993	42.378
1994	42.414
1995	42.414
1996	42.461
1997	42.505
1998	42.545
1999	42.624
2000	42.764
2001	42.811
2002	42.901
2003	43.028
2004	43.159
2005	43.273
2006	43.406
2007	43.556
2008	43.728
2009	43.956
2010	44.181
2011	44.468
2012	44.825
2013	45.186
2014	45.54
2015	45.872
2016	46.088
2017	46.167
2018	46.229
2019	46.298
2020	46.393
2021	46.495
2022	46.614