Year	per 1,000
1990	11.124788862237605
1991	10.861206620146875
1992	10.812410166851036
1993	11.063372321093265
1994	14.093120996310061
1995	10.147801650540693
1996	10.005450575249812
1997	9.764206168708382
1998	9.507494088154195
1999	9.250794567091878
2000	9.003237990973567
2001	8.77900309250679
2002	8.542430416038638
2003	8.320390064977357
2004	8.070308878619176
2005	7.840417472608538
2006	7.619009547748317
2007	7.364869946379233
2008	7.131154954605905
2009	6.858911879854298
2010	6.652112992901504
2011	6.435229127879379
2012	6.176859819904946
2013	6.025702996339239
2014	5.83721773907427
2015	5.680139034493758
2016	5.543914988600289
2017	5.409902961292023
2018	5.295288073398154
2019	5.200021249840543
2020	5.124141475125754
2021	5.012261037399509
2022	4.923709285023542