Year	per 1000 people
1980	1.8
1981	1.8
1982	2
1983	2.1
1984	2.3
1985	2.3
1986	2.3
1987	2.3
1988	2.4
1989	2.5
1990	2.5
1991	2.4
1992	2.6
1993	2.6
1994	2.898
1995	2.903
1996	2.6
1997	2.916
1998	2.8
2001	3.66
2002	2.925
2003	3.001
2004	3.045
2005	3.202
2006	3.163
2007	3.419
2008	3.395
2009	3.403
2010	3.582
2011	3.622
2012	3.652
2013	3.648
2014	3.655