Year	Percent
1991	44.985
1992	45.058
1993	44.425
1994	43.561
1995	43.95
1996	43.646
1997	44.582
1998	45.497
1999	44.515
2000	44.744
2001	45.66
2002	45.2
2003	41.468
2004	40.913
2005	41.668
2006	42.369
2007	43.019
2008	43.571
2009	44.101
2010	44.334
2011	43.997
2012	43.552
2013	42.628
2014	42.78
2015	41.802
2016	41.326
2017	41.372
2018	41.309
2019	41.245
2020	41.169
2021	41.096
2022	41.035