Year	Years
1980	-8.274
1981	-7.72
1982	-7.555
1983	-5.941
1984	-5.63
1985	-5.846
1986	-6.327
1987	-4.964
1988	-3.555
1989	-2.324
1990	-1.639
1991	-0.9977
1992	0.03057
1993	0.7884
1994	1.607
1995	1.59
1996	2.662
1997	3.247
1998	1.716
1999	2.035
2000	2.839
2001	2.799
2002	2.567
2003	2.631