Year	Percent
1991	8.897
1992	9.243
1993	9.522
1994	9.612
1995	10.684
1996	11.361
1997	11.666
1998	11.503
1999	10.442
2000	10.591
2001	11.188
2002	11.37
2003	10.219
2004	9.39
2005	8.978
2006	8.385
2007	8.441
2008	9.25
2009	9.516
2010	10.041
2011	10.399
2012	10.883
2013	11.484
2014	10.945
2015	11.029
2016	10.583
2017	10.15
2018	10.035
2019	9.574
2020	9.49
2021	9.33
2022	9.594