Year	% of total
1970	3.4425464283926517
1971	3.4063276960874487
1972	3.4830409935113873
1973	3.6746551994878427
1974	3.90051392947594
1975	4.143254747705758
1976	3.803600471858184
1977	3.629979869574128
1978	3.9229018926637353
1979	4.917223874897265
1980	4.570712616293973
1981	3.468611673995285
1982	3.621867427132407
1983	2.8687964414485028
1984	2.5133676099942686
1985	2.4103350095487777
1986	2.381994062334596
1987	2.314090913747288
1988	1.9701144439086524
1989	3.030323306127737
1990	5
1991	5
1992	5
1993	4.761904761904762
1994	4.545454545454546
1995	4.3478260869565215
1996	4.166666666666666
1997	4.166666666666666
1998	4
1999	3.8461538461538463
2000	3.8461538461538463
2001	3.8461538461538463
2002	3.8461538461538463
2003	3.8461538461538463
2004	3.8461538461538463
2005	3.8461538461538463
2006	3.8461538461538463
2007	3.8461538461538463
2008	3.8461538461538463