Year	Years
1970	7.909
1971	8.339
1972	8.18
1973	7.272
1974	6.054
1975	4.719
1976	4.984
1977	6.292
1978	7.024
1979	6.573
1980	6.668
1981	6.624
1982	6.042
1983	5.46
1984	6.336
1985	6.39
1986	6.184
1987	6.09
1988	5.863
1989	5.549
1990	5.142
1991	5.031
1992	5.412
1993	5.519
1994	5.244
1995	5.274
1996	4.545
1997	3.732
1998	2.074
1999	1.818
2000	2.156
2001	1.54
2002	1.038
2003	0.7686
2004	1.08