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
1994	0
1995	0.13741109539285012
1996	1.0122764104770425
1997	0.6801393174041653
1998	0.6362238603591774
1999	0.8089794919747876
2000	0.7451454655079232
2001	0.7021504360345818
2002	0.7617180730762938
2003	0.6678366957296719
2004	0.678098291112727
2005	0.7991194287097289
2006	0.738993767324302
2007	0.6997771121470996
2008	0.6484506361564161
2009	0.6474080519466678
2010	0.6047198631108477
2011	0.6068225113481378
2012	0.5471146239151067
2013	0.5351101269777625
2014	0.5333191814884621