Year	% of total
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	0
1992	0
1993	0.19131702208614276
1994	1.5896665212309251
1995	1.273223707578226
1996	1.3272976375620233
1997	1.2693152846055245
1998	1.2077087794432548
1999	1.2056354930572526
2000	1.2345305656402639
2001	1.1797840438799716
2002	1.5190150432484324
2003	2.2683180208870315
2004	2.290399554890352
2005	2.123124249639867
2006	1.9136036377415688
2007	1.8931741519109997
2008	1.972608903188033
2009	1.8878290289176949
2010	1.7602194222630114
2011	1.8353358367016581
2012	1.9538462649546655
2013	2.0530051409280894
2014	2.339286360399206