Year	%
1994	20.3076923076923
1995	20.3076923076923
1996	20.3076923076923
1997	20.3076923076923
1998	20.3076923076923
1999	19.8461538461538
2000	18.7692307692308
2001	18.4615384615385
2002	18.4615384615385
2003	18.4615384615385
2004	18.4615384615385
2005	18.4615384615385
2006	19.7948717948718
2007	20.9230769230769
2008	20.9230769230769
2009	20.9230769230769
2010	20.9230769230769
2011	20.1025641025641
2012	16
2013	16
2014	16
2015	16
2016	16
2017	16
2018	16
2019	16
2020	14.8333333333333