Year	Percent
1991	44.84
1992	44.763
1993	44.552
1994	44.163
1995	43.94
1996	44.067
1997	43.806
1998	43.731
1999	43.55
2000	43.39
2001	43.517
2002	43.576
2003	43.649
2004	43.48
2005	43.4
2006	43.607
2007	43.783
2008	43.92
2009	43.943
2010	43.846
2011	44.301
2012	44.673
2013	45.161
2014	45.213
2015	45.307
2016	45.195
2017	45.534
2018	45.868
2019	46.191
2020	46.5
2021	46.812
2022	47.114