Year	% of total
1960	100
1961	100
1962	100
1963	100
1964	100
1965	100
1966	100
1967	100
1968	100
1969	100
1970	100
1971	100
1972	100
1973	100
1974	100
1975	100
1976	100
1977	100
1978	100
1979	100
1980	100
1981	100
1982	100
1983	100
1984	100
1985	100
1986	100
1987	100
1988	100
1989	100
1990	103.89833333333334
1991	94.29428571428572
1992	94.29428571428572
1993	7.037676767676768
1994	7.778484848484848
1995	8.4341
1996	8.499668874172185
1997	18.672453987730062
1998	11.388198757763975
1999	22.566153846153846
2000	15.604255319148935
2001	9.133919413919415
2002	19.381414392059554
2003	35.39081395348837
2004	8.952537931034483
2005	14.550148331273178
2006	26.381582969432316
2007	45.94678145695364
2008	7.391169265033408
2009	12.792743271221532
2010	13.134947478991595
2011	18.316117404737383
2012	7.583106893106893
2013	13.805176470588238
2014	16.453906056860323
2015	13.096428571428573
2016	13.030946428571427