Year	per 1,000
1990	1.2093832932414708
1991	1.1974328806977164
1992	1.2140293555853658
1993	1.203319524500347
1994	1.1295934696023997
1995	1.1158965209417748
1996	1.0723588016107586
1997	1.012355465528897
1998	0.9943961069603685
1999	0.9750042861690686
2000	0.9116171940346218
2001	0.899328607420078
2002	0.8633965565553905
2003	0.8124026795448234
2004	0.7934563617715592
2005	0.7868918076388205
2006	0.720630209410154
2007	0.7110460828047019
2008	0.6926448359415582
2009	0.6756240200947443
2010	0.6213202101253333
2011	0.6588776828229541
2012	0.5978554155809287
2013	0.5884533300286853
2014	0.5839755282519279
2015	0.5804088509637784
2016	0.5604164452032546
2017	0.559529082812841
2018	0.5906473713359387
2019	0.5842969004853497
2020	0.5807982838661153
2021	0.5798413072603423
2022	0.5978808653986544