Year	Percent
1991	9.806
1992	9.737
1993	9.667
1994	9.996
1995	10.511
1996	10.728
1997	10.48
1998	10.712
1999	10.663
2000	10.435
2001	10.274
2002	10.447
2003	10.432
2004	10.331
2005	10.003
2006	10.146
2007	10.659
2008	11.045
2009	11.092
2010	11.221
2011	11.451
2012	11.452
2013	11.372
2014	11.389
2015	11.554
2016	11.529
2017	11.71
2018	11.748
2019	11.799
2020	11.861
2021	11.916
2022	11.974