Year	per 1000 people
1965	1.07
1966	0.96
1967	0.94
1968	0.91
1969	0.88
1970	0.86
1971	0.85
1972	0.86
1973	0.89
1974	0.92
1975	0.96
1976	1
1977	1.03
1978	1.08
1979	1.12
1980	1.18
1981	1.25
1982	1.3
1983	1.32
1984	1.33
1985	1.34
1986	1.35
1987	1.37
1988	1.47
1989	1.54
1990	1.123
1991	1.55
1992	1.55
1993	1.55
1994	1.58
1995	1.179
1996	1.185
1997	1.2
1998	1.199
1999	1.23
2000	1.255
2001	1.055
2002	1.133
2009	1.421
2010	1.462
2011	1.5
2012	1.569
2013	1.668
2014	1.724
2015	1.812