Year	per 1,000
1990	13.379584140515961
1991	13.849327692357182
1992	12.391818653935696
1993	11.906610266679019
1994	11.507252114824873
1995	11.016825360122315
1996	10.505480505985483
1997	10.037603352036227
1998	9.473128087064012
1999	8.946198831600581
2000	8.492209178259174
2001	8.029094948068154
2002	7.662649158417767
2003	7.335816450536481
2004	7.134854923185621
2005	7.009336442129221
2006	6.3849392387670365
2007	6.084020976703909
2008	5.749272007887361
2009	5.438717952610814
2010	5.046947953887341
2011	4.687683065260606
2012	4.409344922286981
2013	4.061319882655148
2014	3.7965619656059006
2015	3.5008411203876024
2016	3.240991189896082
2017	3.007149852250049
2018	2.782760710893963
2019	2.603526757692718
2020	2.455495319325042
2021	2.2998927108449396
2022	2.1530077078930088