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	94.4530303030303
1991	94.65976744186047
1992	71.1398
1993	82.10891304347827
1994	83.11866666666667
1995	82.10891304347827
1996	85.56333333333333
1997	84.50043478260869
1998	82.30377777777778
1999	84.96707317073171
2000	88.008
2001	84.4101886792453
2002	83.21269230769232
2003	84.8443137254902
2004	89.17477272727274
2005	89.72446808510638
2006	87.0013725490196
2007	89.94528301886791
2008	87.2746
2009	40.18630136986302
2010	93.63946428571428
2011	92.24796874999998
2012	68.0255072463768
2013	101.2092
2014	100.2812244897959
2015	87.23015151515152
2016	86.8796923076923