Year	%
1992	11
1993	11
1994	11
1995	10.86
1996	11
1997	11
1998	11
1999	10
2000	9
2001	8
2002	7
2003	6
2004	2.64
2005	2.98
2006	2.19
2007	3.01
2008	2.56
2009	2.06
2010	2.2
2011	1.96
2012	1.89
2013	6
2015	0.64
2016	6
2017	0.61
2018	0.53
2019	0.31
2020	0.33
2021	0.34