Year	per 1000 people
1980	3.515
1981	3.631
1982	3.741
1983	3.82
1984	3.909
1985	4.002
1986	4.06
1987	4.143
1988	4.2
1989	4.275
1990	4.29
1991	4.345
1992	4.297
1993	4.342
1994	4.314
1995	4.407
1996	2.992
1997	2.97
1998	2.99
1999	2.986
2000	2.978
2003	2.951
2006	3.125
2010	3.494
2011	3.495
2012	3.501
2013	3.506
2014	3