Year	% of total
1960	72.12772797481357
1961	69.75669076459042
1962	69.21717560361763
1963	69.71001924883554
1964	68.1674166149277
1965	69.59110062973795
1966	68.76136156104687
1967	66.24079800331194
1968	65.51641274571057
1969	57.043839001919274
1970	54.346032039575576
1971	82.3807386989023
1972	82.02836548717582
1973	86.09145669990782
1974	87.5034682017265
1975	85.10712971292499
1976	85.90782342518618
1977	85.96065551298697
1978	85.59946029761622
1979	86.50684701515631
1980	88.73916913111826
1981	84.04110629501658
1982	84.68615163212908
1983	86.87203071271443
1984	87.64256184015586
1985	83.91765355232512
1986	84.19727773847531
1988	84.26165750975979
1989	84.21699907984404
1990	65.92403609963709
1991	73.88483019512802
1992	78.83146646736732
1993	74.69747546996058
1994	73.36615576530967
1995	80.36995444568673
1996	73.81289612175621
1997	76.24824935505353
1998	82.00001298128014
1999	79.48220735430883
2000	78.11414330131853
2001	82.99840311132394
2003	78.91949141931693
2004	74.35802887435344
2005	74.07539838220826
2007	77.33190404908285
2008	79.05580749595917
2009	82.46059807106724
2011	75.74619174198912
2013	81.49641303209461
2014	84.64713126247665
2015	12.149598874298338