Year	per 1,000
1990	14.473943868166835
1991	14.511818166402533
1992	14.021141890171137
1993	14.029934442677455
1994	16.913810836101653
1995	13.431219038599444
1996	13.223089325589987
1997	12.724880175646673
1998	12.291139167160674
1999	11.85190843534044
2000	11.315282902697101
2001	10.95384436496709
2002	10.661196789809162
2003	10.414087844505977
2004	10.269641313320829
2005	10.219685809920104
2006	9.853348708116075
2007	9.687534189943916
2008	9.803963468834304
2009	9.373757504785074
2010	9.439265818251917
2011	9.093461120751055
2012	9.122804239053096
2013	9.062526742042508
2014	8.994004352587199
2015	9.00033033823274
2016	8.827897398949386
2017	8.688112453832272
2018	8.526427452429507
2019	8.204274213469395
2020	7.93518402008044
2021	7.718661700330604
2022	7.52238269597717