Year	per 1,000
1990	2.2919625948984823
1991	2.3123388010122934
1992	2.4138250725993764
1993	2.397402497112976
1994	2.3235474276087213
1995	2.2988973823730596
1996	2.271468301436557
1997	2.2164429653851037
1998	2.2051555138740864
1999	2.3720628242748787
2000	2.1551436890318434
2001	2.1242194802265884
2002	2.080945399240012
2003	2.004403710602393
2004	1.922981894314021
2005	1.855610675921203
2006	1.8151377972763743
2007	1.740497123976459
2008	1.6982635377483168
2009	1.636939788857569
2010	1.5561820306896386
2011	1.515130983183872
2012	1.4308150564987927
2013	1.4021765239582997
2014	1.339294711751287
2015	1.3021006087338254
2016	1.2415690517145113
2017	1.2419544800629636
2018	1.1961194880402255
2019	1.1317805361999869
2020	1.1268120410683353
2021	1.0815586513289819
2022	1.1330986106114345