Year	Percent
1991	8.323
1992	8.002
1993	7.973
1994	8.009
1995	7.881
1996	7.791
1997	7.921
1998	7.83
1999	7.661
2000	7.858
2001	7.455
2002	7.48
2003	7.893
2004	7.895
2005	7.837
2006	8.151
2007	8.276
2008	8.209
2009	8.581
2010	9.068
2011	9.3
2012	9.736
2013	9.858
2014	10.538
2015	10.453
2016	10.905
2017	10.863
2018	10.835
2019	10.808
2020	10.768
2021	10.721
2022	10.676