Year	Years
1970	4.5
1971	4.074
1972	4.52
1973	3.401
1974	3.228
1975	2.244
1976	1.239
1977	0.4329
1978	0.1284
1979	-0.00409
1980	0.0934
1981	-2.176
1982	-2.703
1983	-2.717
1984	-2.43
1985	-3.132
1986	-4.096
1987	-3.876
1988	-3.657
1989	-3.771
1990	-3.641
1991	-2.127
1992	-2.524
1993	-1.801
1994	-1.511
1995	-0.3727
1996	0.103
1997	0.05074
1998	0.08317
1999	-0.5722
2000	-0.9619
2001	-1.266
2002	-1.21
2003	-0.33
2004	-1.323