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	94.91058823529413
1991	93.71222222222222
1992	55.684074074074076
1993	88.85423076923077
1994	91.675
1995	99.36387096774195
1996	100.84250000000002
1997	95.1128125
1998	81.4888888888889
1999	90.18837837837837
2000	96.76805555555555
2001	82.94404761904762
2002	76.235
2003	83.57348837209302
2004	84.6902380952381
2005	96.5
2006	89.4390243902439
2007	120.32343750000001
2008	123.76125
2009	36.67
2010	100.84249999999999
2011	107.11500000000001
2012	78.27634615384615
2013	127.1990625
2014	113.06583333333333
2015	108.08
2016	118.39171428571429