Year	% of total
1970	1.8965763722474858
1971	1.9447624231041953
1972	1.989845519806013
1973	1.8719046962180896
1974	2.3613539167510145
1975	2.2858353393597364
1976	2.240950899248177
1977	1.9665205181643581
1978	2.230907746699321
1979	2.133143682822091
1980	1.7867067634560907
1981	2.045351741723019
1982	1.912857816629976
1983	2.011609215646427
1984	2.046598007295529
1985	2.1908767118810264
1986	2.124041006293321
1987	2.010703265858981
1988	2.1550397151677814
1989	1.999052889613126
1990	5.660377358490567
1991	5.660377358490567
1992	5.555555555555555
1993	5.454545454545454
1994	5.357142857142857
1995	5.263157894736842
1996	5.660377358490567
1997	5.88235294117647
1998	5.88235294117647
1999	5.357142857142857
2000	5.454545454545454
2001	4.225352112676056
2002	4.10958904109589
2003	4.10958904109589
2004	4.3478260869565215
2005	4.761904761904762
2006	4.225352112676056
2007	4.225352112676056
2008	4.615384615384616