Year	% of total
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	100.23133333333334
1991	95.74944444444444
1992	95.74944444444444
1993	96.5
1994	96.04047619047618
1995	99.009
1996	97.78666666666666
1997	97.43742857142857
1998	98.34227272727273
1999	98.02173076923077
2000	98.6296551724138
2001	99.12359375
2002	99.82388888888889
2003	100.00909090909089
2004	98.2756
2005	98.48514285714285
2006	99.10810810810811
2007	98.72692307692307
2008	99.009
2009	102.81980392156862
2010	100.84249999999999
2011	81.59075
2012	93.71222222222222
2013	80.4951219512195
2014	106.0241304347826
2015	98.2756
2016	112.0472222222222