Year	% of total
1970	74.12146085788855
1971	75.2180469742263
1972	76.47768993510147
1973	74.40614032261998
1974	72.37730205582392
1975	70.1421938497656
1976	55.1421080279916
1977	62.93611914546889
1978	62.39112970985457
1979	62.22164309670756
1980	62.053517933036076
1981	67.6948143539786
1982	67.21671907171151
1983	66.732511440752
1984	66.21250761250747
1985	66.3834953605774
1986	66.9078389203738
1987	67.1661793921981
1988	67.17832129457888
1989	67.13339647624093
1994	0
1995	80
1996	80
1997	80
1998	80
1999	80
2000	80
2001	80
2002	80
2003	80
2004	80
2005	80
2006	80
2007	80
2008	80