Year	per 1,000
1990	8.005054042994852
1991	7.833631138676466
1992	7.774804945614735
1993	7.770704635814158
1994	7.728004578228025
1995	7.734946643266636
1996	7.682905692420092
1997	7.639333654221272
1998	7.66468943272596
1999	7.678104636429066
2000	7.64686085501541
2001	7.615883889339948
2002	7.477438287429166
2003	7.39479732491531
2004	7.329545307339721
2005	7.081550731100395
2006	6.910351004684394
2007	6.7611453068359095
2008	6.573828469793675
2009	6.3632538816964175
2010	6.157830691739626
2011	5.974910827522692
2012	5.786572688135425
2013	5.649467915120075
2014	5.519995393403565
2015	5.4078275971577225
2016	5.305803777595682
2017	5.198932694415575
2018	5.090076825323401
2019	4.968048829785654
2020	4.872212633880771
2021	4.8027163797915104
2022	4.84739220741838