Year	Percent
1991	8.298
1992	9.024
1993	8.76
1994	9.947
1995	9.977
1996	9.625
1997	9.364
1998	9.287
1999	10.236
2000	10.965
2001	11.606
2002	11.855
2003	12.913
2004	16.082
2005	17.18
2006	16.749
2007	17.305
2008	18.468
2009	20.317
2010	21.299
2011	20.86
2012	19.837
2013	20.191
2014	19.753
2015	19.028
2016	19.292
2017	19.253
2018	19.325
2019	19.363
2020	19.304
2021	19.292
2022	19.297