Year	per 1,000
1990	1.8112513099752463
1991	1.7376710385568177
1992	1.6726893046091618
1993	1.6061124089854706
1994	1.5300783039122265
1995	1.5193514532313417
1996	1.4473569958702759
1997	1.3745239507621532
1998	1.3363174497689763
1999	1.3716651425676918
2000	1.2418753665123938
2001	1.2061524404647506
2002	1.1838706682724693
2003	1.101006034030508
2004	1.065293342326543
2005	1.0353532042873126
2006	1.0059200277210352
2007	0.967515980547055
2008	0.8908303138908661
2009	0.8482639831632011
2010	0.8137107286544611
2011	0.8164054543977
2012	0.7323030225102194
2013	0.7107225616067262
2014	0.6857716072299642
2015	0.6587428026822694
2016	0.6399537941544459
2017	0.62977084693556
2018	0.6140462694074578
2019	0.6146693075603612
2020	0.6006418952818343
2021	0.5997082208539694
2022	0.5972793384950998