Year	% of total
1960	0
1961	0
1962	0
1963	0
1964	0
1965	0
1966	0
1967	2.001187144916476
1968	1.4689265536723164
1969	4.055488174651304
1970	3.3111635557462633
1971	2.0157643106344487
1972	3.7756202804746493
1973	6.108682747827964
1974	9.018483110261313
1975	4.366854697529663
1976	5.895786726323639
1977	3.014062571572534
1978	0.7334413246940245
1979	0.2717145186124445
1980	0.17259691980881572
1981	0.1576211979211042
1982	0.3524229074889868
1983	0.6265806061978636
1984	0.22960020408907028
1985	0.3426633963353051
1986	0.09798432250839866
1987	0.051509220150406924
1988	0.04349280695884911
1989	0.015944894444798775
1990	0.03099333643266698
1991	0.07508409418548774
1992	0.6110536876026024
1993	0.1838074398249453
1994	0.06025652061633813
1995	0.14142310465309743
1996	0.04386806678913169
1997	0
1998	0.0026587259385302564
1999	0
2000	0
2001	0
2002	0
2003	0.04904725703215048
2004	0.05605381165919283
2005	0.00930925339787749
2006	0.0527498738589973
2007	0.0022855575617671932
2008	0.30101936101799276
2009	0.020712033691574806
2010	0.004453946196329948
2011	0.0044960996335678795
2012	0.0067775167178745705
2013	0.006933530553757974
2014	0.006895759108148489
2015	0.00226218753534668