Year	Years
1960	3.514
1961	3.711
1962	5.353
1963	6.381
1964	5.597
1965	5.041
1966	3.816
1967	3.947
1968	5.227
1969	5.638
1970	5.788
1971	5.594
1972	5.695
1973	5.847
1974	5.494
1975	5.236
1976	5.185
1977	4.83
1978	3.668
1979	2.797
1980	2.037
1981	1.759
1982	1.173
1983	0.7163
1984	0.3157
1985	0.1489
1986	0.8392
1987	1.841
1988	1.506
1989	1.04
1990	1.669
1991	1.644
1992	1.858
1993	1.831
1994	2.509
1995	2.942
1996	2.982
1997	2.39
1998	2.474
1999	2.796
2000	3.005
2001	2.326
2002	1.711
2003	1.417
2004	1.216