Year	Years
1970	5.254
1971	5.084
1972	4.673
1973	4.963
1974	4.982
1975	3.602
1976	3.148
1977	2.535
1978	2.839
1979	2.375
1980	1.502
1981	0.6889
1982	0.3035
1983	0.5967
1984	0.9152
1985	1.55
1986	2.428
1987	2.331
1988	1.937
1989	1.248
1990	0.7816
1991	1.07
1992	0.8237
1993	0.3137
1994	0.0055
1995	0.4185
1996	-0.08692
1997	-0.1907
1998	0.01466
1999	0.2391
2000	0.9905
2001	0.7831
2002	1.18
2003	1.698
2004	1.61