Year	per 1000 people
1980	2.938
1985	3.35
1986	3.408
1987	3.484
1988	3.485
1989	3.49
1990	3.504
1991	3.536
1992	3.264
1993	3.207
1994	3.2
1995	3.191
1996	3.148
1997	3.114
1998	3.11
1999	3.206
2000	4.373
2001	3.16
2006	3.33
2008	3.409
2010	3.242
2011	3.292
2012	3.28
2013	3.277
2014	3.316
2015	3.43