Year	Years
1960	3.913
1961	2.109
1962	1.849
1963	1.632
1964	3
1965	2.286
1966	3.203
1967	1.671
1968	1.674
1969	2.371
1970	2.96
1971	3.182
1972	3.412
1973	2.684
1974	2.736
1975	3.271
1976	3.315
1977	3.478
1978	2.946
1979	2.384
1980	1.699
1981	1.623
1982	1.224
1983	1.527
1984	1.803
1985	1.438
1986	1.158
1987	1.421
1988	1.509
1989	1.639
1990	2.884
1991	2.577
1992	2.891
1993	3.126
1994	2.008
1995	2.276
1996	2.34
1997	2.271
1998	2.412
1999	2.1
2000	1.828
2001	0.9975
2002	1.075
2003	0.7873
2004	2.113