Year	per 1,000
1990	12.190931775756003
1991	11.903525929624466
1992	11.695094734504833
1993	11.362581786292573
1994	11.084447196326694
1995	10.792698616236542
1996	10.518698951604575
1997	10.225050303634156
1998	9.946390942744133
1999	9.604053829406809
2000	9.296551174825671
2001	9.01354458429049
2002	8.763026937063763
2003	8.563126602992972
2004	8.428736423391396
2005	8.981471908144787
2006	8.365238681304444
2007	8.35593631361395
2008	8.342676944579159
2009	8.272622728967605
2010	8.17889558948672
2011	8.015805186864405
2012	7.898878786678693
2013	7.782385436698869
2014	7.679744339593711
2015	7.576469301859626
2016	7.4787965061519115
2017	7.329177645097744
2018	7.205409496462729
2019	7.048401253265327
2020	6.886566539042569
2021	6.716742027164264
2022	6.572290283494762