Year	per 1,000
1990	25.747478082133988
1991	25.081054693495247
1992	24.722237080017297
1993	24.368745451145017
1994	25.12374823892735
1995	22.833700927740576
1996	22.2358475487381
1997	21.612733278441354
1998	20.884607623184724
1999	20.179473737184736
2000	19.45798399324818
2001	18.78705214607443
2002	18.10656685535043
2003	17.45781186484433
2004	16.76897992944841
2005	16.10175222481793
2006	15.434895858116656
2007	14.800762424725258
2008	14.24573321720767
2009	13.60885503697377
2010	13.103874665514796
2011	12.594984218455712
2012	12.080879556606236
2013	11.649765232044125
2014	11.260505634472752
2015	10.911162705337517
2016	10.593872163754442
2017	10.291261462068062
2018	10.011189911303294
2019	9.758943205989109
2020	9.496762340943322
2021	9.234738754057767
2022	8.986569390491178