Year	per 1,000
1990	8.672442567389446
1991	8.55782498470627
1992	8.397989160085945
1993	8.387599236721016
1994	9.023916232658319
1995	8.147616529340937
1996	7.999569656504639
1997	7.762441074359302
1998	7.5607956923043735
1999	7.410393426677318
2000	7.165135494958697
2001	6.971784738075826
2002	6.823013628893849
2003	6.698800316111989
2004	6.594614800199338
2005	6.393096417567175
2006	6.206858871397191
2007	6.135367843720747
2008	6.140926028610542
2009	5.9856928800102365
2010	6.0079681440708335
2011	5.871211198238887
2012	5.8164910677916
2013	5.750251943508192
2014	5.664313540970307
2015	5.611373670582824
2016	5.485987664181799
2017	5.404050878900019
2018	5.268931783095861
2019	5.118117569119593
2020	4.961427538843171
2021	4.845535471478132
2022	4.776865900218253