Year	per 1000 people
1980	3.036
1981	3.154
1982	3.253
1983	3.396
1984	3.531
1985	3.629
1986	3.724
1987	3.791
1988	3.872
1989	3.962
1990	3.976
1991	3.839
1992	3.908
1993	3.766
1994	3.604
1995	3.635
1996	3.639
1997	3.301
1998	3.528
1999	3.201
2000	3.292
2001	3.302
2002	3.612
2003	3.539
2004	3.6
2005	3.7
2006	3.88
2007	3.877
2008	3.7
2009	3.687
2010	3.506
2011	3.548
2012	3.489
2013	3.501
2014	3.274