Year	per 1,000
1990	1.8184045213712388
1991	1.7595709783725095
1992	1.6966712294079858
1993	1.6936571990330749
1994	1.7727475006559352
1995	1.860440685241477
1996	1.9067174283009285
1997	1.829644116230665
1998	1.6893129462095335
1999	1.4749343773407246
2000	1.27566096649374
2001	1.1794803021600169
2002	1.110870628833691
2003	1.0644503078151786
2004	1.0342380255153834
2005	1.0147331676808706
2006	0.9858093926319472
2007	0.9405575864841309
2008	0.9386146555744793
2009	0.8798980724170827
2010	0.7973130652653513
2011	0.7599421494965104
2012	0.737753099827074
2013	0.6594012654441389
2014	0.6354627937327011
2015	0.6230840941865515
2016	0.6236621926701006
2017	0.5691151933713879
2018	0.5484371194466571
2019	0.5420729756332984
2020	0.5427269216048284
2021	0.5085811154393138
2022	0.5027367973090006