Year	% of total
1990	0
1991	0
1992	0
1993	0
1994	0
1995	0
1996	0
1997	0
1998	0
1999	0
2000	0
2001	0
2002	0
2003	0
2004	0
2005	0
2006	0
2007	0
2008	0
2009	0.4148583099310697
2010	0.31534688156972673
2011	0.3206806282722513
2012	0.3692657292998154
2013	0.21775256432296142
2014	0.18564356435643564
2015	0.1919508605796916