Year	Percent
1991	7.14
1992	7.287
1993	7.22
1994	7.689
1995	7.645
1996	7.647
1997	7.707
1998	7.721
1999	7.782
2000	7.728
2001	7.71
2002	7.675
2003	7.698
2004	7.652
2005	7.674
2006	7.709
2007	7.774
2008	7.856
2009	7.898
2010	7.95
2011	8.01
2012	8.112
2013	8.213
2014	8.296
2015	8.237
2016	8.105
2017	8.149
2018	8.165
2019	8.176
2020	8.186
2021	8.19
2022	8.2