Year	Years
1980	6.337
1981	2.861
1982	2.779
1983	2.386
1984	0.8413
1985	0.9234
1986	0.4325
1987	-2.238
1988	-1.225
1989	-2.594
1990	-2.004
1991	0.068
1992	-0.6876
1993	-0.1523
1994	0.6728
1995	-0.3499
1996	-0.2702
1997	0.3519
1998	-0.9681
1999	-1.77
2000	-1.254
2001	-0.585
2002	0.08321
2003	0.6325
2004	0.191