Year	per 1,000
1990	9.913505960303818
1991	10.625557602958615
1992	9.565299970277747
1993	9.661691658262708
1994	11.217534453704124
1995	9.004295557741353
1996	8.818540747700274
1997	8.553297437775015
1998	8.358806914786692
1999	7.893583930433582
2000	7.596129672859734
2001	7.366140595399313
2002	7.155419456820973
2003	6.994057109564885
2004	6.960123825408035
2005	6.731425354032472
2006	6.5936916096505795
2007	6.443247162467605
2008	6.775390410713864
2009	6.1197808589047895
2010	6.27091005853999
2011	5.749399883629919
2012	5.637427289496791
2013	5.519204978724577
2014	5.3761059073379815
2015	5.309754804263634
2016	5.150805873922988
2017	5.091959502435146
2018	5.045531052027846
2019	4.947230471172321
2020	4.8948165835430615
2021	4.840447745018612
2022	4.758683509962324