Year	Percent
1991	7.735
1992	7.761
1993	7.873
1994	7.95
1995	8.067
1996	8.194
1997	8.172
1998	8.221
1999	8.219
2000	8.328
2001	8.226
2002	8.973
2003	10.453
2004	11.615
2005	11.517
2006	11.124
2007	10.251
2008	8.45
2009	8.83
2010	7.678
2011	6.754
2012	6.172
2013	5.533
2014	4.971
2015	5.727
2016	6.464
2017	5.725
2018	5.49
2019	5.251
2020	5.012
2021	4.789
2022	4.587