Year	Years
1980	-7.518
1981	-8.974
1982	-9.534
1983	-9.049
1984	-7.668
1985	-6.4
1986	-6.746
1987	-6.137
1988	-6.059
1989	-5.566
1990	-5.716
1991	-1.381
1992	0.8287
1993	3.829
1994	3.823
1995	4.361
1996	4.467
1997	3.768
1998	3.647
1999	1.223
2000	4.349
2001	1.153
2002	-0.8902
2003	-1.705