Year	per 1000 people
1960	0.666
1965	0.815
1970	0.883
1974	0.904
1975	0.904
1976	0.904
1980	0.83
1981	0.996
1982	0.833
1984	1.436
1985	1.196
1986	1.399
1987	1.401
1988	1.6
1989	1.695
1990	1.564
1995	1.94
2001	1.925