Year	Years
1980	7.544
1981	5.767
1982	1.642
1983	-2.829
1984	-5.505
1985	-5.464
1986	-5.842
1987	-6.093
1988	-5.32
1989	-6.36
1990	-5.591
1991	-4.897
1992	-2.739
1993	-1.225
1994	-0.4689
1995	-0.2718
1996	-0.154
1997	0.3752
1998	-0.06991
1999	-0.3133
2000	-0.955
2001	-1.801
2002	-2.373
2003	-0.969