Year	Years
1960	1.813
1961	3.232
1962	3.175
1963	2.881
1964	3.23
1965	3.237
1966	3.701
1967	3.876
1968	5.06
1969	5.471
1970	4.286
1971	3.883
1972	3.163
1973	3.585
1974	2.953
1975	2.926
1976	2.75
1977	2.857
1978	2.627
1979	2.747
1980	4.159
1981	4.41
1982	4.786
1983	3.95
1984	4.326
1985	4.298
1986	4.231
1987	3.508
1988	2.168
1989	2.217
1990	0.6457
1991	1.123
1992	1.091
1993	1.387
1994	1.216
1995	0.7052
1996	0.5781
1997	1.046
1998	2.567
1999	2.558
2000	2.588
2001	1.547
2002	1.493
2003	1.62