Year	% of total
1960	98.64864864864865
1961	98.70129870129871
1962	100
1963	100
1964	100
1965	100
1966	100
1967	100
1968	99.27536231884059
1969	100
1970	97.12643678160919
1971	90.9502262443439
1972	89.7872340425532
1973	89.38775510204083
1974	88.72180451127821
1975	89.58990536277602
1976	86.24161073825502
1977	88.52459016393442
1978	91.20879120879121
1979	86.57314629258516
1980	93.52112676056338
1981	95.12697323266988
1982	95.78034682080924
1983	95.32554257095158
1984	99.93946731234867
1985	99.94337485843715
1986	99.81617647058823
1987	99.80119284294236
1988	86.83333333333334
1989	95.96541786743515
1990	12.644827586206898
1991	-6.088603773584906
1992	97.6900395256917
1993	39.47806306306306
1994	36.31788751714678
1995	41.87909985935302
1996	54.71580441640379
1997	44.07077389984826
1998	41.9860650887574
1999	40.71944785276074
2000	44.606044776119404
2001	46.34439178515008
2002	47.45876205787781
2003	54.46396721311476
2004	52.650045871559634
2005	48.37555219364599
2006	48.38329496402878
2007	56.35980295566503
2008	52.74941534713764
2009	63.5780204778157
2010	63.2649276974416
2011	66.53051442910916
2012	69.13281869688386
2013	50.701126187245585
2014	68.3718064516129
2015	77.18554307116105
2016	69.82311111111112