Year	Years
1960	1.304
1961	1.5
1962	1.43
1963	1.127
1964	1.234
1965	1.033
1966	1.23
1967	1.561
1968	1.858
1969	1.942
1970	2.143
1971	2.369
1972	2.539
1973	2.893
1974	2.78
1975	2.994
1976	3.104
1977	3.12
1978	3.533
1979	3.481
1980	3.351
1981	2.896
1982	2.333
1983	1.842
1984	1.712
1985	1.73
1986	1.747
1987	1.847
1988	1.4
1989	1.217
1990	1.216
1991	1.256
1992	1.492
1993	1.711
1994	1.806
1995	2.002
1996	1.953
1997	1.899
1998	1.656
1999	1.272
2000	1.114
2001	0.9871
2002	0.9046
2003	0.8571