Year	Years
1980	-1.128
1981	-0.4851
1982	-0.2919
1983	-0.1111
1984	0.1395
1985	1.408
1986	2.208
1987	1.862
1988	3.071
1989	3.923
1990	3.912
1991	3.102
1992	2.977
1993	2.949
1994	2.99
1995	1.993
1996	2.109
1997	2.824
1998	0.8453
1999	-0.09922
2000	-0.4049
2001	-0.3985
2002	0.5498
2003	0.6408