Year	per 1000 people
1980	2.962
1985	3.329
1986	3.375
1987	3.445
1988	3.512
1989	3.576
1990	3.56
1991	3.576
1992	3.638
1993	4.076
1994	4.142
1995	4.155
1996	4.286
1997	4.365
1998	4.431
1999	4.551
2000	4.579
2001	4.497
2002	4.526
2003	4.55
2004	4.622
2005	4.68
2006	4.78
2007	4.869
2008	4.98
2009	3.702
2010	3.511
2011	3.788
2012	3.873
2013	3.925
2014	4.07