Year	Percent
1991	43.678
1992	44.034
1993	44.078
1994	44.538
1995	44.446
1996	44.578
1997	44.484
1998	44.518
1999	44.879
2000	44.909
2001	44.356
2002	44.602
2003	45.077
2004	45.844
2005	46.217
2006	46.902
2007	47.669
2008	47.801
2009	47.161
2010	47.646
2011	48.018
2012	48.334
2013	48.638
2014	48.861
2015	49.045
2016	48.847
2017	48.66
2018	48.426
2019	48.077
2020	47.853
2021	47.641
2022	47.424