Year	Years
1980	-1.563
1981	-1.583
1982	-0.9922
1983	-2.751
1984	-1.809
1985	0.1564
1986	-1.08
1987	-1.465
1988	-2.66
1989	-5.987
1990	-10.61
1991	-10.92
1992	-15.49
1993	-18.09
1994	-20.38
1995	-20.21
1996	-18.88
1997	-13.56
1998	-12.01
1999	-8.173
2000	-1.537
2001	-1.169
2002	3.845
2003	4.597