Year	Percent
1991	9
1992	8.946
1993	8.854
1994	8.898
1995	9.052
1996	9.047
1997	9.114
1998	9.128
1999	9.041
2000	9.567
2001	9.306
2002	9.213
2003	9.881
2004	9.67
2005	9.623
2006	9.799
2007	10.043
2008	10.212
2009	9.93
2010	9.899
2011	9.944
2012	9.831
2013	9.709
2014	9.572
2015	9.616
2016	9.612
2017	9.846
2018	9.946
2019	10.068
2020	10.14
2021	10.2
2022	10.253