Year	Percent
1991	16.265
1992	14.706
1993	14.158
1994	14.918
1995	15.187
1996	15.05
1997	13.9
1998	12.867
1999	12.612
2000	12.406
2001	12.337
2002	11.673
2003	11.23
2004	11.298
2005	11.007
2006	11.193
2007	10.73
2008	11.411
2009	10.77
2010	10.713
2011	10.404
2012	10.303
2013	10.647
2014	10.578
2015	10.097
2016	9.886
2017	10.131
2018	9.971
2019	9.841
2020	9.724
2021	9.61
2022	9.493