Year	per 1,000
1990	9.277097904445824
1991	9.723384121100018
1992	8.97380051077828
1993	8.999255635894185
1994	10.01380676335924
1995	8.475865710477992
1996	8.298484776579912
1997	8.062556818687403
1998	7.885491030885717
1999	7.511291378191036
2000	7.2674128768632835
2001	7.067323123305799
2002	6.874649518312899
2003	6.727330855242515
2004	6.668109912493046
2005	6.735812324765953
2006	6.3932513273580875
2007	6.274410527270332
2008	6.470545838820325
2009	6.0164381615313856
2010	6.104719732812741
2011	5.736391167338102
2012	5.64060070953028
2013	5.541378293933726
2014	5.420061453270702
2015	5.349419477097304
2016	5.218140519807972
2017	5.136053318893735
2018	5.073714161870799
2019	4.980042176595376
2020	4.894682778505903
2021	4.824328207126133
2022	4.725114686300602