Year	Percent
1991	12.734
1992	15.673
1993	11.836
1994	10.482
1995	6.414
1996	5.684
1997	7.164
1998	7.679
1999	7.362
2000	9.113
2001	8.81
2002	7.43
2003	9.904
2004	10.913
2005	10.27
2006	10.736
2007	10.974
2008	10.973
2009	12.058
2010	13.344
2011	13.729
2012	11.371
2013	11.04
2014	11.636
2015	10.78
2016	11.343
2017	11.424
2018	11.614
2019	11.433
2020	11.367
2021	11.362
2022	11.122