Year	Percent
1991	9.728
1992	9.688
1993	10.141
1994	10.883
1995	9.009
1996	9.368
1997	9.351
1998	9.42
1999	9.284
2000	10.05
2001	9.812
2002	12.583
2003	12.699
2004	12.815
2005	13.212
2006	12.919
2007	13.11
2008	13.411
2009	13.051
2010	12.617
2011	11.68
2012	12.623
2013	12.217
2014	11.94
2015	11.655
2016	10.762
2017	10.814
2018	10.792
2019	10.733
2020	10.571
2021	10.442
2022	10.341