Year	per 1,000 people
1960	1.31314718723297
1970	1.29849994182587
1975	1.29009997844696
1989	0.523999989032745
1990	0.7296000123
1994	0.2475000024
1996	0.4499999881
1998	0.400000006
2007	0.1
2008	0.3