Year	Percent
1991	7.446
1992	7.741
1993	8.088
1994	8.44
1995	8.825
1996	9.232
1997	9.626
1998	10.064
1999	10.501
2000	11.007
2001	11.435
2002	12.401
2003	13.881
2004	15.2
2005	15.869
2006	15.502
2007	14.852
2008	12.88
2009	13.587
2010	12.653
2011	12.141
2012	11.793
2013	11.402
2014	10.987
2015	12.21
2016	13.546
2017	13.404
2018	13.26
2019	13.087
2020	12.885
2021	12.665
2022	12.426