Year	Percent
1991	7.946
1992	7.812
1993	7.997
1994	8.561
1995	8.885
1996	8.965
1997	9.148
1998	8.922
1999	8.877
2000	8.799
2001	8.722
2002	8.447
2003	8.456
2004	8.705
2005	8.719
2006	8.568
2007	8.696
2008	8.958
2009	9.012
2010	9.248
2011	9.569
2012	9.663
2013	9.784
2014	9.755
2015	9.814
2016	9.898
2017	9.807
2018	9.832
2019	9.866
2020	9.917
2021	10.006
2022	10.095