Year	% of total
1960	63.1578947368421
1961	70.86280056577085
1962	66.15776081424936
1963	74.68706536856746
1964	76.66666666666666
1965	83.46774193548386
1966	87.72845953002611
1967	82.57345491388044
1968	88.73591989987484
1969	80.61573546180159
1970	76.40984908657666
1971	77.08333333333333
1972	77.61976047904191
1973	76.8956289027654
1974	76.07843137254902
1975	69.22462030375699
1976	73.95209580838323
1977	73.91920623671156
1978	70.9103840682788
1979	74.19122933141625
1980	72.92634372926344
1981	78.21846553966189
1982	73.60838244924688
1983	74.0952380952381
1984	72.09821428571429
1985	64.31693989071039
1986	61.933045356371494
1987	48.047162859248346
1988	41.05075690115761
1989	42.97452752670502
1990	48.83498806682577
1991	49.041674757281555
1992	67.78393939393939
1993	64.11532224532225
1994	61.138300884955754
1995	55.21635446685879
1996	53.52515731874144
1997	53.66464827586207
1998	59.154134007585334
1999	60.03495575221238
2000	60.238114583333335
2001	55.500540540540534
2002	64.24862396204033
2003	54.178491260349595
2004	59.69778306374881
2005	47.525379061371844
2006	53.47857982370224
2007	52.87869771863117
2008	64.25241594022417
2009	50.55942332896461
2010	90.56781400966184
2011	89.75174825174825
2012	53.1543935538592
2013	52.72493009565857
2014	56.83419600938967
2015	52.83489216202
2016	66.253928734582