Year	per 1000 people
1960	0.391
1965	0.517
1970	0.614
1979	0.679
1984	0.99
1987	0.968
1988	0.881
1990	1.26
1993	0.883
1994	0.845
1995	0.854
1996	0.864
1997	0.872
1998	0.901
1999	1.719
2000	1.326
2013	1.15