Year	Years
1980	1.137
1981	2.441
1982	0.8542
1983	2.767
1984	4.423
1985	5.347
1986	5.48
1987	5.331
1988	4.155
1989	5.017
1990	6.947
1991	4.932
1992	5.576
1993	5.683
1994	4.728
1995	5.396
1996	5.039
1997	4.369
1998	3.605
1999	3.788
2000	3.273
2001	3.548
2002	2.727
2003	1.779