Year	per 1000 people
1960	0.559
1965	0.473
1970	0.463
1979	0.516
1984	0.817
1990	1.1
1991	1.066
1992	1.006
1994	1.103
1995	1.08
1998	1.153
2002	0.9
2003	0.954
2004	0.991
2005	0.986
2006	1.045
2007	1.041
2008	1.043
2009	1.033