Year	% of total
1960	87.30158730158729
1961	91.71779141104295
1962	98.25174825174825
1963	98.49624060150376
1964	98.89502762430939
1965	98.19494584837545
1966	100
1967	13.215771745591443
1968	9.843046599342987
1969	18.13305827746261
1970	8.812521265736645
1971	12.180247331865154
1972	20.99181511795859
1973	28.783308195072905
1974	50.64731267163592
1975	47.245091830272315
1976	51.12566516577978
1977	53.857377348167056
1978	46.85773480662983
1979	50.246513593463874
1980	52.814501839989106
1981	67.30304187348861
1982	70.8546906663488
1983	67.31372076199662
1984	61.478349987189354
1985	64.6591970121382
1986	51.73341946597761
1987	58.450624929625036
1988	59.67156961515212
1989	56.062094714089206
1990	52.42926018287615
1991	75.94828031212485
1992	75.73625742574256
1993	82.85232166018159
1994	82.5100529100529
1995	85.10687383302214
1996	73.91704060913705
1997	76.90906266050334
1998	77.99038095238096
1999	85.72070152390961
2000	83.91700025081515
2001	81.82818006275646
2002	76.02296559633027
2003	77.39788166214994
2004	74.64590019784568
2005	69.77973336047222
2006	66.49176422928903
2007	64.0398098941456
2008	64.29896055954926
2009	69.15576286935514
2010	67.37463742792241
2011	66.4204047306176
2012	63.89554684512429
2013	64.98438807055828
2014	60.7174120603015
2015	61.68651374442794
2016	58.35101211410707