Year	per 1,000
1990	6.922181476515769
1991	5.966808406453878
1992	5.697415167361725
1993	5.491904380327628
1994	5.354385326871718
1995	5.198576457822529
1996	5.029126455290477
1997	4.919255454003675
1998	4.757778030211734
1999	4.611955241858723
2000	4.51356311576183
2001	4.418564238565376
2002	4.378293044011133
2003	4.65004693463394
2004	4.2116732726336314
2005	4.178891512887456
2006	4.137987658221654
2007	4.08644867015046
2008	4.098086136767436
2009	4.0261147400363235
2010	4.0080431988835805
2011	4.088758160057957
2012	4.6545278137567445
2013	4.698708341578654
2014	4.534548101186019
2015	4.767729304931593
2016	4.533731270923046
2017	4.6028552181453195
2018	4.723144010886328
2019	4.297426495903348
2020	4.02288346338192
2021	3.9899504831311123
2022	3.8328210200335855