Year	Percent
1991	9.157
1992	9.922
1993	10.146
1994	11.134
1995	10.699
1996	9.639
1997	12.513
1998	12.312
1999	10.958
2000	9.692
2001	9.696
2002	9.669
2003	8.316
2004	9.745
2005	9.095
2006	9.23
2007	10.217
2008	8.388
2009	8.997
2010	8.518
2011	7.933
2012	7.852
2013	8.194
2014	9.624
2015	7.111
2016	4.167
2017	4.043
2018	3.871
2019	3.737
2020	3.609
2021	3.491
2022	3.383