Year	per 1,000
1990	7.972399069625908
1991	6.71407958203992
1992	6.439207974511048
1993	6.222858758695556
1994	6.09777396394137
1995	5.893068550782378
1996	5.782469549069878
1997	5.6646923628681005
1998	5.55393243347667
1999	5.451196579040872
2000	5.402388106454132
2001	5.372032791766798
2002	5.366173355182463
2003	5.709465533889097
2004	5.311321211752872
2005	5.265476864701572
2006	5.276183827826468
2007	5.2254864740505695
2008	5.157093989402046
2009	5.109134382794969
2010	4.99398500383859
2011	5.173528316845511
2012	6.2802058646691865
2013	6.18027258510933
2014	5.716173694891268
2015	6.169353445046531
2016	5.8028374422089835
2017	5.930558670096994
2018	6.3438735094674135
2019	5.632285929653202
2020	5.157830351746939
2021	5.044869981759608
2022	4.753165723108964