Year	per 1,000
1990	11.319200201978983
1991	11.075466218263191
1992	10.965380986289327
1993	11.038270989905381
1994	12.797585991636186
1995	10.36257303819771
1996	10.201061504691948
1997	10.011104684106133
1998	9.779369575555522
1999	9.569836577908136
2000	9.355219198910172
2001	9.162027481238036
2002	8.956148642661546
2003	8.763894704030841
2004	8.546850372459582
2005	8.346221676630108
2006	8.172607977681606
2007	7.954796522065778
2008	7.76896002808267
2009	7.552672737864971
2010	7.386655938016026
2011	7.1922161417800465
2012	6.995235609107741
2013	6.845108101930105
2014	6.692925024959821
2015	6.537355962432055
2016	6.406591805676384
2017	6.264657041557105
2018	6.134053717435977
2019	6.039938437253378
2020	5.918521267085737
2021	5.805613810854198
2022	5.683239463970878