Year	Percent
1991	6.827
1992	6.816
1993	6.6
1994	6.562
1995	6.308
1996	6.354
1997	6.406
1998	6.766
1999	6.672
2000	6.648
2001	6.615
2002	6.838
2003	7.03
2004	7.08
2005	6.994
2006	7.2
2007	7.5
2008	7.726
2009	7.48
2010	7.803
2011	8.434
2012	8.383
2013	8.842
2014	9.223
2015	9.286
2016	9.016
2017	9.123
2018	9.286
2019	9.437
2020	9.568
2021	9.716
2022	9.82