Year	Years
1980	17.02
1981	15.01
1982	13.99
1983	7.566
1984	-2.402
1985	-4.571
1986	-7.432
1987	-7.293
1988	-6.315
1989	-6.292
1990	-6.002
1991	-5.58
1992	-3.872
1993	-3.35
1994	-2.245
1995	-0.6621
1996	2.945
1997	3.258
1998	3.709
1999	2.84
2000	2.44
2001	2.92
2002	2.927
2003	4.742