Year	Percent
1991	30.142
1992	37.632
1993	39.506
1994	39.22
1995	41.402
1996	40.646
1997	39.616
1998	40.094
1999	41.669
2000	43.844
2001	43.891
2002	43.486
2003	43.564
2004	43.364
2005	43.941
2006	44.229
2007	43.05
2008	42.165
2009	44.875
2010	45.536
2011	45.22
2012	44.784
2013	46.177
2014	47.187
2015	46.893
2016	46.961
2017	47.038
2018	47.286
2019	47.573
2020	47.778
2021	47.996
2022	48.231