Year	Percent
1960	96.56132
1961	87.71139
1962	94.32783
1963	105.22022
1964	90.43806
1965	113.28912
1966	113.99135
1967	140.93915
1968	128.86223
1969	106.27039
1970	116.90621
1971	106.09267
1972	102.80115
1973	92.06009
1974	119.33057
1975	129.29942
1976	140.56662
1977	114.00969
1978	149.0404
1979	161.80299
1980	183.02566
1981	172.34059
1982	158.3032
1983	153.9608
1984	138.93504
1985	139.32943
1986	140.71129
1987	146.88371
1988	142.1931
1989	155.68603
1990	109.35647
1991	113.22139
1992	117.14193
1993	114.42617
1994	120.34157
1995	110.30132
1996	119.66856
1997	118.13363
1998	130.38204
1999	129.53163
2000	112.53662
2001	141.52558
2002	138.52542
2003	143.64223
2004	139.84889
2005	111.07173
2006	108.466
2007	103.18894
2008	95.6257
2009	96.07819
2010	84.70799
2011	80.07468
2012	78.23656
2013	78.66206
2014	84.37886
2015	79.65973
2016	82.33383
2017	82.4221