Year	% of total
1960	2.439768222018908
1961	2.14168039538715
1962	0.5681818181818182
1963	0.8053382420616659
1964	0.9334163036714374
1965	2.0583190394511153
1966	0.50170220390611
1967	2.9095190043726875
1968	5.347422350304195
1969	1.5898483080513421
1970	14.533476741059426
1971	16.48936170212766
1972	16.074660633484164
1973	19.209558823529413
1974	21.85306504445484
1975	35.11821325109803
1976	47.11327891698188
1977	24.48638838475499
1978	22.761833002260428
1979	26.546695625193916
1980	42.890964093121134
1981	59.02777777777778
1982	51.01907924724881
1983	52.030133495817864
1984	46.55379004949206
1985	35.103668261563
1986	38.73173611452748
1987	25.66283639257822
1988	15.619982158786797
1989	45.903949273944185
1990	33.162797262013974
1991	33.8737890204521
1992	46.80822333997232
1993	32.571797353985154
1994	25.684559902980787
1995	31.10065170166546
1996	17.54946683325101
1997	19.85233798195242
1998	27.468064872645026
1999	25.65363284708953
2000	19.415752098127825
2001	20.22613065326633
2002	24.987951807228917
2003	13.484232927065195
2004	12.711089298860061
2005	19.03308218584914
2006	10.801630434782608
2007	10.384680996247015
2008	9.121495327102803
2009	6.638777737359039
2010	5.602428712447152
2011	5.172679617637989
2012	4.805160610847815
2013	3.360113982665136
2014	2.6116745895802462
2015	2.5584524482751894