Year	Percent
1991	13.34
1992	13.389
1993	13.099
1994	12.78
1995	12.989
1996	13.048
1997	12.336
1998	12.476
1999	11.775
2000	9.73
2001	8.973
2002	10.706
2003	10.905
2004	10.919
2005	11.233
2006	10.443
2007	9.33
2008	10.914
2009	10.583
2010	10.515
2011	10.716
2012	10.793
2013	10.023
2014	9.683
2015	10.998
2016	10.991
2017	10.867
2018	10.975
2019	10.847
2020	10.794
2021	10.762
2022	10.672