Year	per 1,000 people
1990	6.72
1991	6.46
1992	6.2
1993	5.94
1994	5.68
1995	5.42
1996	5.16
1997	4.9
1998	4.8
1999	4.6
2000	4.5
2001	4.4
2002	4.3
2003	4.2
2004	4.1
2005	4
2006	3.9
2007	3.675
2008	3.566
2009	3.554
2010	3.484
2011	3.459
2012	3.436
2013	3.309
2014	3.829
2015	3.304
2016	3.302
2017	3.26
2018	3.317
2019	3.225
2020	3.489
2021	3.815
2022	3.854