Year	Percent
1991	7.733
1992	9.461
1993	9.487
1994	12.15
1995	13.498
1996	11.546
1997	9.647
1998	7.993
1999	5.935
2000	6.3
2001	7.319
2002	7.591
2003	8.438
2004	8.988
2005	9.004
2006	9.355
2007	9.534
2008	9.631
2009	9.694
2010	10.857
2011	11.469
2012	12.036
2013	12.991
2014	11.384
2015	12.927
2016	11.548
2017	11.734
2018	11.727
2019	11.704
2020	11.726
2021	11.768
2022	11.829