Year	% of total
1960	44.865718799368096
1961	44.94556765163297
1962	38.617200674536264
1963	35.623003194888184
1964	47.49536178107607
1965	47.77448071216617
1966	37.80487804878049
1967	41.440000000000005
1968	21.980413492927095
1969	24.29718875502008
1970	29.054054054054053
1971	29.57920792079208
1972	28.155339805825243
1973	25.947187141216993
1974	24.70076169749728
1975	20.724801812004532
1976	25.671321160042964
1977	25.446898002103048
1978	23.83419689119171
1979	19.921875
1980	24.083769633507853
1981	22.815533980582522
1982	26.849642004773273
1983	20.036429872495447
1984	20.814061054579096
1985	22.557905337361532
1986	24.8642779587405
1987	22.07421503330162
1988	23.175182481751825
1989	19.198664440734557
1990	28.021415094339623
1991	0
1992	0
1993	0
1994	0
1995	0
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