Year	per 1,000
1990	27.738996468075875
1991	27.036979422281092
1992	26.34563781964655
1993	25.996618377415082
1994	27.023248386652057
1995	23.807348673726747
1996	22.97926610270591
1997	22.107528194855856
1998	21.48070401361161
1999	20.201409112118217
2000	19.296461196916113
2001	18.487097657882323
2002	17.647119029525417
2003	16.873772626481912
2004	16.125191472391126
2005	15.366639429950924
2006	14.660059598758034
2007	13.995996475558227
2008	13.43524222598891
2009	12.772103447658917
2010	12.798614961221077
2011	11.785855577937948
2012	11.262095532207553
2013	10.837924731781932
2014	10.47870336481721
2015	10.145786995555186
2016	9.81858023555965
2017	9.528429576706849
2018	9.278191193264458
2019	9.054504525109795
2020	8.819594360610662
2021	8.616776889677558
2022	8.385070395498499