Year	% of total
1960	2.150537634408602
1961	2.5
1962	2.2222222222222223
1963	1.7857142857142856
1964	2.205882352941176
1965	0.7751937984496124
1966	1.7699115044247788
1967	0.704225352112676
1968	1.1494252873563218
1969	0.5617977528089888
1970	0.5524861878453038
1971	0
1972	0
1973	0.45454545454545453
1974	0.49261083743842365
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0.35842293906810035
1981	0.3205128205128205
1982	4.748603351955307
1983	13.970588235294118
1984	18.27956989247312
1985	41.284403669724774
1986	22.22222222222222
1987	22.134387351778656
1988	27.504553734061933
1989	31.58783783783784
1990	29.241163793103446
1991	24.88914027149321
1992	21.461244239631334
1993	24.14217081850534
1994	18.26195219123506
1995	5.238571428571428
1996	0
1997	0
1998	0
1999	0
2000	0
2001	0
2002	0
2003	0
2004	0
2005	0
2006	0
2007	0
2008	0
2009	0
2010	0
2011	0
2012	0
2013	0
2014	0
2015	0
2016	0