Year	per 1000 people
1980	3.623
1985	4.099
1986	4.077
1987	4.112
1988	4.183
1989	4.162
1990	4.694
1991	4.614
1992	4.098
1993	3.64
1994	3.438
1995	3.376
1996	3.509
1997	3.448
1998	3.298
1999	3.358
2000	3.43
2001	3.302
2002	3.419
2003	3.447
2004	3.583
2005	3.684
2006	3.793
2007	3.691
2008	3.935
2009	3.761
2010	3.117
2011	3.128
2012	3.14
2013	3.193
2014	3.223
2015	3.209