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	99.82758620689656
1986	99.82238010657191
1987	99.84301412872841
1988	99.83333333333334
1989	99.81981981981983
1990	92.43543778801843
1991	92.68426605504587
1992	93.69353211009175
1993	92.25574660633484
1994	98.20404878048781
1995	87.62924882629108
1996	86.00183856502241
1997	97.78666666666666
1998	97.97116981132075
1999	85.04619230769231
2000	85.82340425531915
2001	86.14195266272189
2002	88.37368421052632
2003	90.18837837837837
2004	86.2603869653768
2005	83.78493852459016
2006	85.02179324894514
2007	116.26718253968254
2008	95.00160337552742
2009	95.6640518962076
2010	87.1460358565737
2011	95.69801941747573
2012	96.3148775510204
2013	93.60315487571701
2014	93.2055195911414
2015	86.399766718507
2016	76.3197378768021