Year	per 1,000
1990	3.371209844633193
1991	3.3446430035226613
1992	3.447945889973985
1993	3.418835216717284
1994	3.2533398813248344
1995	3.1664567506133396
1996	3.0703968378360456
1997	2.9616331879465925
1998	2.8910392419557436
1999	2.806372495990791
2000	2.736801750092085
2001	2.676282722458075
2002	2.5702186859616063
2003	2.51514989158582
2004	2.4546316005081947
2005	2.389526651579435
2006	2.347003405119634
2007	2.238769287081141
2008	2.1559548248702933
2009	2.0247876366383157
2010	1.8995397203188
2011	1.8526314942765254
2012	1.735284900345357
2013	1.6888556190939208
2014	1.6980304318539658
2015	1.6722348570428516
2016	1.6646053761915955
2017	1.6872935972045264
2018	1.679461316786592
2019	1.7128660380760306
2020	1.7995116319025917
2021	1.9191088768797122
2022	2.1878939738142056