Year	%
1995	28.1
1996	28.2
1997	28.2
1998	28.2
1999	28.2
2000	11.45
2001	9.47
2002	10.28
2003	9.3
2004	9.18
2005	9.2
2006	8.91
2007	8.37
2008	8.39
2009	8.42
2010	8.39
2011	8.43
2012	7.02
2013	8.18
2014	7.02
2015	8
2016	8
2017	6.86