Year	per 1,000
1990	14.635287479732337
1991	14.604565389457692
1992	14.594574149351123
1993	14.571254207588543
1994	14.526298047844897
1995	14.472144407060487
1996	14.387494818794085
1997	14.263095028363347
1998	14.196023400751594
1999	14.003359847007909
2000	13.794558250054909
2001	13.551499308509847
2002	13.279536931371178
2003	12.96226738872401
2004	12.62721237731263
2005	12.812879685933504
2006	11.761450897477228
2007	11.274781797611276
2008	10.87704781880867
2009	10.488206041851965
2010	10.17446270839923
2011	9.918200599037291
2012	9.70690234693593
2013	9.48252655409389
2014	9.36116955925224
2015	9.21524319171302
2016	9.08551691747533
2017	8.937928747773443
2018	8.789955300603339
2019	8.728769378633482
2020	8.626492442451719
2021	8.592979354267873
2022	8.480479092294333