Year	Years
1980	2.391
1981	1.159
1982	1.4
1983	0.7958
1984	0.5406
1985	0.78
1986	0.7474
1987	0.2772
1988	0.08939
1989	0.331
1990	-1.675
1991	-0.9545
1992	-1.772
1993	-1.244
1994	-2.218
1995	-2.073
1996	-1.6
1997	-1.178
1998	-0.7757
1999	-0.922
2000	1.059
2001	2.095
2002	2.781
2003	2.996