Year	% of total
1960	1.4844804318488531
1961	1.1315417256011315
1962	1.1450381679389312
1963	1.1126564673157162
1964	0.2564102564102564
1965	0.5376344086021505
1966	0.7832898172323759
1967	0.4052684903748733
1968	0.7509386733416771
1969	1.0262257696693273
1970	2.3828435266084194
1971	2.514367816091954
1972	4.04191616766467
1973	4.7279214986619085
1974	4.313725490196078
1975	7.673860911270983
1976	9.880239520958083
1977	8.646350106307585
1978	10.170697012802277
1979	10.567936736161036
1980	11.81154611811546
1981	14.369310793237974
1982	16.895874263261295
1983	17.142857142857146
1984	20.200892857142854
1985	26.721311475409838
1986	30.6695464362851
1987	43.10980103168755
1988	51.20213713268033
1989	48.15119145439606
1990	41.571002386634845
1991	39.87417475728156
1992	37.695734265734266
1993	41.47293139293139
1994	44.13380530973451
1995	40.210187319884724
1996	41.4355950752394
1997	45.11674482758621
1998	39.868773704171936
1999	32.978661504424785
2000	28.57204166666667
2001	26.155922444183314
2002	27.317627520759196
2003	28.13503219871205
2004	49.12593720266413
2005	49.27944945848375
2006	60.15891283055828
2007	58.665028517110265
2008	45.48358655043586
2009	71.12922673656618
2010	50.044806763285024
2011	64.10839160839161
2012	30.356166242578457
2013	30.949587932303164
2014	28.36329812206573
2015	57.117238295633875
2016	36.938031064412975