Year	per 1,000 people
1990	10.24
1991	10.37
1992	10.28
1993	9.908
1994	9.674
1995	9.419
1996	9.12
1997	8.662
1998	8.471
1999	8.35
2000	7.93
2001	7.395
2002	6.961
2003	6.739
2004	6.472
2005	6.194
2006	5.875
2007	5.759
2008	5.609
2009	5.597
2010	5.583
2011	5.803
2012	5.923
2013	5.986
2014	5.975
2019	5.684