Year	Percent
1960	38.3211
1961	52.03324
1962	72.39586
1963	56.83475
1964	55.31471
1965	49.94312
1966	53.34217
1967	56.81463
1968	49.0209
1969	46.78107
1970	49.21082
1971	51.03309
1972	50.04102
1973	62.25316
1974	68.19934
1975	64.39275
1976	74.78101
1977	77.54704
1978	76.48762
1979	72.15613
1980	71.83712
1981	66.25992
1982	64.70409
1983	61.4544
1984	50.20754
1985	47.5745
1986	43.87818
1997	71.98378
1998	39.34928
1999	41.67044
2000	38.93664
2001	31.41806
2002	30.77855
2003	35.86385
2004	222.87761
2005	211.27273
2006	194.69267
2007	236.39184
2008	144.72841
2009	94.94719
2010	92.63535
2011	94.46035
2012	89.25382
2013	96.41378
2014	108.53634
2015	106.54867
2016	100.27606