Year	per 1,000
1990	7.513206063823121
1991	7.546542566767988
1992	7.444980864085708
1993	7.321471601906835
1994	7.219100993760112
1995	7.135523199547645
1996	6.928836960720503
1997	6.778673138124973
1998	6.599054002413515
1999	6.434093235532537
2000	6.245456446731913
2001	6.088111179695377
2002	5.9386840128714455
2003	5.778400229303912
2004	5.661168030045077
2005	5.464226063964833
2006	5.345444535062456
2007	5.271516360308816
2008	5.1956098569112275
2009	5.162749357912013
2010	5.17154162367723
2011	5.192803838147424
2012	5.288594572162437
2013	5.414389698225643
2014	5.594788425051017
2015	5.844268482801821
2016	6.050637977283758
2017	6.171903763646883
2018	6.177430662182709
2019	6.150781684985101
2020	6.088386771158474
2021	5.9896982241487535
2022	5.849039002045186