Year	Years
1980	0.1255
1981	0.1214
1982	0.6772
1983	0.1612
1984	-0.2659
1985	0.2624
1986	0.1366
1987	0.5223
1988	-0.2729
1989	-1.083
1990	-1.301
1991	-2.309
1992	-3.868
1993	-3.8
1994	-3.741
1995	-3.893
1996	-3.17
1997	-5.231
1998	-5.392
1999	-5.735
2000	-5.293
2001	-4.659
2002	-3.067
2003	-2.407