Year	per 1,000
1990	5.282030015319523
1991	5.173608002045992
1992	5.051057630363575
1993	4.922896963615646
1994	4.820073545747661
1995	4.711631250099525
1996	4.586289869661915
1997	4.492029531848005
1998	4.410771862711185
1999	4.414330932459602
2000	4.2619831541203546
2001	4.199992453978825
2002	4.10582483813314
2003	4.021251051672713
2004	3.930566078217893
2005	3.836359140016609
2006	3.782701573601595
2007	3.723551592536907
2008	3.7078909846185777
2009	3.6431599867978
2010	3.5826731293530196
2011	3.541206570668426
2012	3.4234382032260773
2013	3.353656135892319
2014	3.315552632837005
2015	3.317180309515731
2016	3.391637046597908
2017	3.4038214599942616
2018	3.454172318880198
2019	3.53861959187616
2020	3.651271469384613
2021	3.8104046834993666
2022	3.962173875238749