Year	% of total
1970	3.226591773725878
1971	2.9634187739091895
1972	2.7110948175098164
1973	2.86212066281887
1974	2.998595710915696
1975	3.1530462222255724
1976	4.619458351657484
1977	3.715529995445049
1978	3.666782360591615
1979	3.5808625079996257
1980	3.49458647028598
1981	2.894778349737904
1982	2.850977801617555
1983	2.8072149881720625
1984	2.7622602177486355
1985	2.6524948732105957
1986	2.513749603054306
1987	2.398341100339671
1988	2.3016801723781866
1989	2.2090150568226727
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