Year	per 1,000
1990	6.007510296362652
1991	5.771114119880164
1992	5.398006469271238
1993	5.101198553698699
1994	4.821445496578205
1995	4.622593565507281
1996	4.376089654207573
1997	4.171899856407304
1998	3.9904192762960475
1999	3.8051512980658155
2000	3.697674276653439
2001	3.5170797140704573
2002	3.394370990676544
2003	3.1752779458637934
2004	3.657498928361384
2005	2.8876837386222776
2006	2.7466794176900637
2007	2.6040818625325683
2008	3.4132097566374138
2009	2.332880196951843
2010	2.208657080745116
2011	2.1343358475997745
2012	2.006254405877719
2013	1.9911061197068587
2014	1.8318333077152873
2015	1.7733059956457677
2016	1.6684994683222025
2017	1.6241681816033695
2018	1.5800024756443336
2019	1.488678477596906
2020	1.457291760559491
2021	1.429253696025589
2022	1.3439962131689969