Year	Years
1980	5.536
1981	3.735
1982	3.879
1983	2.942
1984	1.633
1985	-0.2574
1986	0.6337
1987	0.6551
1988	-0.908
1989	-0.7731
1990	-1.309
1991	-0.3982
1992	-0.08973
1993	0.9384
1994	2.42
1995	4.393
1996	3.548
1997	3.093
1998	2.901
1999	2.261
2000	1.526
2001	2.261
2002	2.348
2003	2.361
2004	1.42