Year	per 1,000
1990	7.885186487338696
1991	7.496441624588624
1992	7.1408221717476525
1993	6.8315055143947605
1994	6.588439694135349
1995	6.36654281994331
1996	6.104961760707407
1997	5.881955408243362
1998	5.677244373308332
1999	5.493743208277327
2000	5.334520860683416
2001	5.158477190971477
2002	5.005396199532183
2003	4.901785351797929
2004	4.757285417168001
2005	4.649678746082821
2006	4.578598755021572
2007	4.501755489751422
2008	4.532790546603573
2009	4.319145050803712
2010	4.327991154374043
2011	4.312644615618598
2012	4.516723818281505
2013	4.482890644969546
2014	4.3081364187985125
2015	4.195644934462312
2016	3.8716450475119744
2017	3.8084907999302917
2018	3.7704742391606083
2019	3.4231721248179343
2020	3.206299389260099
2021	3.1872259738022857
2022	3.0352336480261335