Year	per 1,000
1990	15.561542879987893
1991	15.765652690321255
1992	15.144264696547092
1993	15.320680530908392
1994	19.742779815961637
1995	14.715607524015443
1996	14.546813071667827
1997	13.95688928883406
1998	13.45537004682587
1999	12.976671718635021
2000	12.334376337231923
2001	11.939992748032468
2002	11.626786919499255
2003	11.35427695951323
2004	11.204485347893275
2005	10.848751005777247
2006	10.609986543559884
2007	10.365439648571307
2008	10.548655191781661
2009	9.935202412512202
2010	10.081650099293988
2011	9.641206970814657
2012	9.741936417877916
2013	9.707209937150122
2014	9.653239489061837
2015	9.711609377343432
2016	9.499051093654442
2017	9.362618263817957
2018	9.181754101079056
2019	8.777375858970437
2020	8.455126946019607
2021	8.215670748571355
2022	7.994546237535551