Year	Percent
1991	7.092
1992	7.198
1993	7.583
1994	8.141
1995	9.174
1996	9.421
1997	9.492
1998	9.593
1999	9.684
2000	9.704
2001	9.064
2002	9.439
2003	8.768
2004	8.896
2005	9.054
2006	9.443
2007	11.65
2008	11.328
2009	11.95
2010	11.944
2011	11.926
2012	11.732
2013	10.781
2014	10.98
2015	10.747
2016	10.325
2017	10.468
2018	10.497
2019	10.489
2020	10.471
2021	10.454
2022	10.44