Year	Years
1980	9.433
1981	9.241
1982	8.68
1983	8.941
1984	9.316
1985	8.99
1986	8.357
1987	8.113
1988	7.333
1989	6.573
1990	5.861
1991	4.451
1992	4.291
1993	2.298
1994	0.8094
1995	-0.3271
1996	-1.117
1997	-2.49
1998	-2.815
1999	-2.395
2000	-2.567
2001	-1.607
2002	-1.905
2003	-1.041