Year	Years
1980	2.147
1981	1.151
1982	1.26
1983	2.311
1984	2.977
1985	3.652
1986	5.879
1987	4.512
1988	6.057
1989	5.363
1990	6.11
1991	5.921
1992	6.06
1993	5.167
1994	3.801
1995	3.437
1996	1.874
1997	1.507
1998	1.314
1999	0.9155
2000	0.5856
2001	0.108
2002	-0.3633
2003	-0.2193