Year	per 1,000
1990	4.01359685861242
1991	3.976739399012922
1992	4.177640906571369
1993	4.097996797348649
1994	3.769369396575664
1995	3.7530967250839526
1996	3.643605072639369
1997	3.5022242595256654
1998	3.375444156786199
1999	3.665644624002939
2000	3.178143627213784
2001	3.0513212220024277
2002	2.9465133922311932
2003	2.7949306529583033
2004	2.6942470588767065
2005	2.585483887694107
2006	2.4468170084906795
2007	2.3004919207907037
2008	2.149014425148097
2009	1.993882973188747
2010	1.8453752298037045
2011	1.7044824291164444
2012	1.5907154538749926
2013	1.5096554526125974
2014	1.4072216170283114
2015	1.371987022033394
2016	1.2709088983556842
2017	1.2495885784363314
2018	1.1822311239617151
2019	1.1653720532712057
2020	1.1191423365939437
2021	1.0590087612448695
2022	1.0954924795624386