Year	Percent
1991	37.852
1992	24.701
1993	32.623
1994	27.436
1995	40.742
1996	45.55
1997	46.839
1998	43.875
1999	43.156
2000	47.523
2001	47.872
2002	45.671
2003	46.929
2004	46.38
2005	47.919
2006	48.214
2007	48.217
2008	49.456
2009	48.047
2010	48.968
2011	53.267
2012	53.181
2013	53.745
2014	51.776
2015	50.057
2016	48.773
2017	48.03
2018	47.88
2019	47.886
2020	47.891
2021	47.895
2022	47.9