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	97.78666666666668
1991	99.22470588235294
1992	99.22470588235294
1993	99.22470588235294
1994	100.00909090909089
1995	100.00909090909089
1996	98.14617647058823
1997	99.53285714285714
1998	97.43742857142857
1999	97.43742857142857
2000	99.10810810810811
2001	96.5
2002	99.92575
2003	102.85487804878048
2004	101.75925
2005	96.3653488372093
2006	95.51255813953489
2007	98.30680851063829
2008	106.10893617021276
2009	99.64673913043478
2010	99.4321153846154
2011	98.550625
2012	94.19156862745098
2013	89.05571428571429
2014	114.79304347826087
2015	99.82388888888889
2016	108.51326530612246