Year	% of total
1970	0.9681504689606034
1971	1.047032720417058
1972	1.063300850140397
1973	1.2050834192267883
1974	1.1061268875073245
1975	1.217538975503784
1976	1.1416670764121635
1977	1.1489883187973866
1978	1.2840268706107145
1979	1.3159847822004518
1980	1.4705091643974668
1981	1.5193530199253646
1982	1.586083566201066
1983	1.577015809569868
1984	1.580279095928944
1985	1.5265953309616616
1986	1.644593010141092
1987	1.688040985314378
1988	1.926484145900892
1989	1.93338260263253
1990	1.9607843137254901
1991	1.9607843137254901
1992	1.9230769230769231
1993	1.8867924528301887
1994	1.8518518518518516
1995	1.8181818181818181
1996	1.7857142857142856
1997	1.7857142857142856
1998	1.7543859649122806
1999	1.7241379310344827
2000	1.7543859649122806
2001	1.7241379310344827
2002	1.7543859649122806
2003	1.7543859649122806
2004	1.7543859649122806
2005	1.7857142857142856
2006	1.639344262295082
2007	1.639344262295082
2008	1.6666666666666667