Year	Percent
1991	12.735
1992	13.014
1993	12.805
1994	13.009
1995	12.5
1996	12.507
1997	13.613
1998	13.801
1999	13.726
2000	14.385
2001	15.098
2002	15.694
2003	16.634
2004	17.67
2005	17.076
2006	17.6
2007	17.998
2008	18.335
2009	19.797
2010	19.362
2011	16.476
2012	15.937
2013	15.545
2014	14.61
2015	14.411
2016	14.441
2017	12.877
2018	12.231
2019	13.419
2020	13.959
2021	14.182
2022	14.315