Year	% of total
1960	76.8327067669173
1961	81.11682586333578
1962	82.16576853990249
1963	82.85591212578073
1964	17.15154146765089
1965	37.18811471166787
1966	32.22407677863551
1967	7.970596713750361
1968	-3.2352941176470593
1969	5.835725023916906
1970	1.1129008639625129
1971	1.2700986353195514
1972	3.715498938428875
1973	6.821963394342761
1974	9.068487952950104
1975	12.181303116147308
1976	23.75942834458118
1977	24.552810902896084
1978	25.161515627728303
1979	24.574512245745122
1980	26.363501263189182
1981	43.717277486910994
1982	49.10791616144119
1983	45.698286102155095
1984	55.50672182006204
1985	55.6966800804829
1986	56.63413621262458
1987	48.17058960615241
1988	49.9331550802139
1989	44.16513386470468
1990	75.68437264957265
1991	37.5829034965035
1992	91.42798348544112
1993	114.09558441558443
1994	116.47478518518517
1995	103.73921301775148
1996	92.06463266545234
1997	103.1821644640235
1998	80.51036851341188
1999	82.22029499199634
2000	66.36671401314395
2001	71.44228059818968
2002	72.72871886120996
2003	67.09759662052849
2004	65.4869860480753
2005	66.80210706319703
2006	65.90810104779675
2007	69.9685365144021
2008	74.62251954464408
2009	82.35601146055437
2010	76.7469124600639
2011	64.36226589452933
2012	76.71351716712526
2013	68.39389397138166
2014	61.90201363962671
2015	58.35794752385279
2016	60.843314419225635