Year	Years
1980	4.811
1981	3.14
1982	1.228
1983	0.6366
1984	0.3688
1985	0.03164
1986	-0.3906
1987	-0.7445
1988	-0.6445
1989	-0.4491
1990	-0.5575
1991	0.2452
1992	1.442
1993	1.436
1994	1.43
1995	1.523
1996	1.715
1997	2.163
1998	2.316
1999	2.815
2000	3.858
2001	4.184
2002	4.147
2003	4.158
2004	4.28