Year	per 1,000 people
1986	11.9
1987	11
1988	11.6
1989	12.5
1990	11.9
1991	11.9
1992	12.1
1993	11.4
1994	10.9
1995	11
1996	10.9
1997	11.2
1998	11.9
1999	12.6
2000	11.3
2001	11.8
2002	11.2
2003	10.3
2004	10.9
2005	10.7
2006	10.6
2007	10.1
2008	10.4
2009	9.9
2010	9.8
2012	9.5
2016	8.8
2018	7.2
2019	7
2022	6.2