Year	per 1,000
1990	10.991487660742184
1991	10.877283672589606
1992	10.25905380105351
1993	9.94682094834103
1994	9.833732733713862
1995	9.247002136204411
1996	8.938567761569796
1997	8.69070476696395
1998	8.446799811793843
1999	8.161118144592548
2000	7.9376749184427995
2001	7.700794027251281
2002	7.486803524352377
2003	7.276963565004968
2004	7.245241039752975
2005	6.915499673381082
2006	6.579623774428582
2007	6.35928246597737
2008	6.3743776206379
2009	5.8974762023282175
2010	5.742220987675586
2011	5.441006157430022
2012	5.253889629429091
2013	5.063772337741397
2014	4.858085719567546
2015	4.678302147905786
2016	4.490354903933683
2017	4.348565784132898
2018	4.211705009356356
2019	4.0646150141893385
2020	3.9518138878291733
2021	3.8526629510906436
2022	3.7389936113102085