Year	per 1,000
1990	5.764684979577678
1991	5.727177277994364
1992	5.591086717691434
1993	5.467516939965178
1994	5.392328928121485
1995	5.3688577537051305
1996	5.199676917004814
1997	5.120978543742177
1998	5.063246597639157
1999	4.990135759565844
2000	4.979213665014561
2001	4.8405947637344
2002	4.784876486482616
2003	4.671375906594861
2004	4.607744781263937
2005	4.470852276252544
2006	4.385739001031096
2007	4.32562498514081
2008	4.200236095180434
2009	4.153964808251959
2010	3.991378073748751
2011	3.902415288239386
2012	3.796792708875954
2013	3.6952332896587605
2014	3.570537661536402
2015	3.455902378526082
2016	3.37949255231395
2017	3.2904968919872486
2018	3.159245234004617
2019	3.170769546046734
2020	3.0164104572198736
2021	2.891293940936203
2022	2.8172947353774895