Year	Years
1980	-0.3181
1981	2.085
1982	2.482
1983	4.767
1984	4.875
1985	3.91
1986	1.816
1987	1.465
1988	2.564
1989	2.552
1990	3.855
1991	3.124
1992	3.016
1993	2.755
1994	1.974
1995	1.474
1996	1.794
1997	2.49
1998	1.911
1999	1.846
2000	1.581
2001	1.788
2002	1.207
2003	0.6008