Year	Years
1980	-1.874
1981	-2.179
1982	-2.93
1983	-2.23
1984	-3.844
1985	-4.504
1986	-1.92
1987	-2.712
1988	-3.28
1989	-2.276
1990	-1.338
1991	-0.8726
1992	-2.395
1993	-1.504
1994	-2.772
1995	-1.755
1996	-2.715
1997	-3.371
1998	-3.834
1999	-3.733
2000	-3.698
2001	-3.919
2002	-3.224
2003	-3.25
2004	-1.074