Year	Percent
1991	25.843
1992	25.73
1993	25.718
1994	25.862
1995	25.544
1996	25.468
1997	25.548
1998	12.963
1999	12.776
2000	12.663
2001	12.655
2002	12.478
2003	12.404
2004	12.354
2005	12.273
2006	12.179
2007	12.244
2008	12.073
2009	12.09
2010	12.132
2011	12.099
2012	12.069
2013	12.037
2014	12
2015	11.986
2016	11.942
2017	11.967
2018	11.939
2019	11.905
2020	11.87
2021	11.834
2022	11.799