Year	per 1,000
1990	20.738455045648593
1991	20.266161631529506
1992	19.588832063338945
1993	19.568504394550267
1994	25.590474807294353
1995	18.590147389225812
1996	18.487876583948673
1997	17.800131629162514
1998	17.46858063324365
1999	17.408580495208877
2000	16.44572713030606
2001	15.842521765170684
2002	15.286126020976594
2003	14.652444756676886
2004	14.263489777318409
2005	13.611376210377998
2006	13.185216843553869
2007	12.830309741504552
2008	12.98195466203323
2009	12.306838694996385
2010	12.46577916535902
2011	12.000869713559382
2012	12.264221342421548
2013	12.037255272836019
2014	11.700925712466056
2015	11.713198273911404
2016	11.34243049172945
2017	11.207054321625384
2018	11.211827087658891
2019	10.888773182070315
2020	10.730794711029771
2021	10.676052748918352
2022	10.631356587959802