Year	Percent
1991	13.551
1992	13.756
1993	13.777
1994	13.829
1995	11.54
1996	14.947
1997	13.936
1998	14.569
1999	15.649
2000	10.404
2001	15.411
2002	15.19
2003	14.983
2004	15.576
2005	15.262
2006	15.194
2007	15.47
2008	15.123
2009	14.789
2010	14.534
2011	15.045
2012	15.361
2013	14.955
2014	14.663
2015	14.062
2016	14.074
2017	14.073
2018	14.072
2019	14.071
2020	14.07
2021	14.069
2022	14.068