Year	Percent
1991	47.083
1992	48.061
1993	48.872
1994	49.579
1995	49.931
1996	49.558
1997	48.793
1998	48.139
1999	47.563
2000	47.226
2001	47.026
2002	46.745
2003	46.678
2004	46.722
2005	46.997
2006	47.349
2007	47.887
2008	48.646
2009	49.214
2010	49.467
2011	50.28
2012	50.436
2013	50.46
2014	50.243
2015	49.855
2016	49.273
2017	48.461
2018	47.423
2019	46.283
2020	45.153
2021	44.072
2022	43.105