Year	% of total
1970	2.2657754904466696
1971	2.286393856442487
1972	2.312875855479946
1973	2.241456504213998
1974	2.6438973071904384
1975	2.6754360973132703
1976	2.639913314446853
1977	2.439081759737278
1978	2.844464649147772
1979	2.7136984195934337
1980	2.5556499018755328
1981	2.8250367859127126
1982	2.6438738769147037
1983	2.8737805916963617
1984	3.03994425651478
1985	3.1051849993869913
1986	3.143953426280069
1987	3.2525664036027373
1988	3.473126620642625
1989	3.248629163565437
1990	6.896551724137931
1991	6.451612903225806
1992	6.451612903225806
1993	6.451612903225806
1994	6.451612903225806
1995	6.451612903225806
1996	6.25
1997	6.451612903225806
1998	6.0606060606060606
1999	9.67741935483871
2000	9.090909090909092
2001	10
2002	10.344827586206897
2003	9.090909090909092
2004	8.571428571428571
2005	8.333333333333332
2006	7.6923076923076925
2007	10.256410256410255
2008	10.256410256410255