Year	Percent
1991	9.837
1992	10.054
1993	9.646
1994	9.292
1995	9.428
1996	9.184
1997	9.244
1998	9.329
1999	9.307
2000	8.952
2001	8.8
2002	8.728
2003	8.725
2004	9.775
2005	10.111
2006	9.901
2007	9.982
2008	9.95
2009	10.081
2010	9.597
2011	9.756
2012	9.845
2013	10.137
2014	10.248
2015	10.288
2016	10.846
2017	10.695
2018	10.799
2019	10.872
2020	10.923
2021	10.963
2022	11.024