Year	per 1,000
1990	5.492446347741535
1991	5.486906672488963
1992	5.238782324849174
1993	5.178679664208122
1994	5.35097840882838
1995	4.94151526094766
1996	4.843072438094598
1997	4.697567668932842
1998	4.598732243694371
1999	4.479131837213374
2000	4.324630616077081
2001	4.234650964051619
2002	4.1682917078511
2003	4.135227884521668
2004	4.175488547855189
2005	4.0855308218442365
2006	3.9859942689681467
2007	3.929297744621876
2008	3.9957566116595693
2009	3.798188896700884
2010	3.774735024406033
2011	3.6175985756732763
2012	3.565190579094215
2013	3.4792095676646957
2014	3.3844082925348453
2015	3.339351903215121
2016	3.247596064222736
2017	3.177877834847628
2018	3.107620889677029
2019	3.0447041653485254
2020	2.9913372845093193
2021	2.924569171236575
2022	2.8520210901392984