Year	Years
1980	2.052
1981	2.77
1982	1.348
1983	1.784
1984	1.754
1985	1.196
1986	1.435
1987	0.9278
1988	-0.5077
1989	-1.059
1990	-1.9
1991	-2.213
1992	-5.024
1993	-7.686
1994	-8.758
1995	-9.681
1996	-9.736
1997	-7.832
1998	-6.704
1999	-7.436
2000	-12.17
2001	-13.76
2002	-9.628
2003	-6.379
2004	-5.494