Year	per 1,000 people
1990	5.842
1991	6.044
1992	5.739
1993	5.661
1994	5.407
1995	4.889
1996	4.798
1997	4.726
1998	4.357
1999	4.312
2000	4.144
2001	3.84
2002	3.792
2003	3.495
2004	3.455
2005	3.394
2006	3.44
2007	3.461
2008	3.501
2009	3.547
2010	3.902
2011	4.011
2012	4.351
2013	4.43
2014	4.712