Year	Years
1980	0.6873
1981	0.2573
1982	1.126
1983	1.069
1984	3.149
1985	5.25
1986	4.977
1987	4.789
1988	3.686
1989	2.585
1990	1.35
1991	1.383
1992	0.1618
1993	-0.6218
1994	-0.4352
1995	-1.014
1996	-1.267
1997	-1.796
1998	-1.811
1999	-1.854
2000	-0.7793
2001	-0.6172
2002	0.2369
2003	0.5558
2004	0.5363