Year	% of total
1990	68.5871453387377
1991	55.695670449768805
1992	43.31408262994225
1993	8.673550436854645
1994	11.240721102863201
1995	7.64251033986693
1996	2.043772127454136
1997	0.3151434732128048
1998	0
1999	0
2000	0
2001	0
2002	0
2003	0
2004	0
2005	0
2006	0
2007	0
2008	0
2009	0
2010	0
2011	0
2012	0
2013	0
2014	0
2015	0