Year	per 1,000
1990	12.406891021588729
1991	12.055751338257696
1992	11.62656339884498
1993	11.41232042461157
1994	13.055415340111743
1995	10.915471894701303
1996	10.753670824006202
1997	10.547403622326375
1998	10.399127735550115
1999	10.386178429411641
2000	10.06678771517767
2001	9.911313060062051
2002	9.711286649861078
2003	9.55227265800192
2004	9.477755745391342
2005	9.154375131286013
2006	8.812447230727024
2007	8.571031185859107
2008	8.43797909694454
2009	8.073885808029093
2010	7.968816012274262
2011	7.620898434088709
2012	7.48573805664121
2013	7.191500617511228
2014	6.8845557900705385
2015	6.730036400099872
2016	6.44780107997607
2017	6.26713765925441
2018	6.151009064972923
2019	5.92011902917852
2020	5.753161315019846
2021	5.677803968144515
2022	5.558018675184393