Year	per 1,000
1990	10.099125774590588
1991	9.925107255489095
1992	9.733650066923046
1993	9.835538858688397
1994	9.325994304187482
1995	9.128881563373142
1996	8.941834995935361
1997	8.763174486046708
1998	8.653797160813467
1999	8.452385929274227
2000	8.292816752757078
2001	8.146670088479302
2002	7.9852595001417015
2003	7.8146328600927095
2004	7.670490809930043
2005	7.509054323404875
2006	7.381245220997715
2007	7.2319926946381266
2008	7.733126146006524
2009	6.941789485331338
2010	7.2650046200906395
2011	6.678227327821498
2012	6.587675559098554
2013	6.462231729737884
2014	6.3171601107028685
2015	6.194374697748015
2016	6.050081716098372
2017	5.953935116644192
2018	5.872740501803772
2019	5.756454757493842
2020	5.635723853158678
2021	5.572338631332796
2022	5.477049077851789