Year	per 1000 people
1980	3.211
1981	3.278
1982	3.406
1983	3.454
1984	3.501
1985	3.577
1986	3.674
1987	3.736
1988	3.763
1989	3.881
1990	3.924
1991	3.701
1992	3.597
1993	3.345
1994	3.122
1995	3.042
1996	3.591
1997	3.156
1998	3.156
1999	3.051
2000	2.987
2001	3.526
2003	3.588
2006	3.7
2007	3.697
2009	2.677
2010	2.759
2011	2.779
2012	2.805
2013	2.811
2014	2.803