Year	% of total
1960	82.16503992901508
1961	80.57190916736752
1962	81.32358911896061
1963	80.13270882123341
1964	77.85858585858585
1965	41.6935636985001
1966	54.54665784248842
1967	36.90191387559809
1968	47.38701878370839
1969	44.53808752025932
1970	47.79141104294478
1971	43.361707533985516
1972	48.442734830624154
1973	42.21610625822664
1974	41.68049300782176
1975	37.8234903782349
1976	46.0775473399459
1977	51.996644295302005
1978	46.70710571923743
1979	44.592069752958274
1980	47.963618802318095
1981	69.0068493150685
1982	66.56687821817746
1983	74.40143844042775
1984	68.11382707041226
1985	64.3765903307888
1986	64.73659960067579
1987	68.4349212953332
1988	74.94601597927014
1989	75.26531838205848
1990	51.25318118735544
1991	84.497025871285
1992	79.59767918088737
1993	64.62793173369381
1994	64.32417326782313
1995	69.8332643080125
1996	63.50981164732234
1997	52.37168926504879
1998	78.95349005646943
1999	95.97993654233092
2000	82.78165213892986
2001	89.39128113879005
2002	97.87440498677749
2003	118.37369034406215
2004	126.93011953778723
2005	99.03352147795535
2006	85.67989867683872
2007	45.199668258680774
2008	73.45507322175733
2009	65.82660621279763
2010	66.08712966813607
2011	75.87552774173854
2012	74.56909456077966
2013	75.44026268840356
2014	73.869938403222
2015	74.70786176706332
2016	82.76973252103278