Year	per 1,000
1990	18.046094714866392
1991	17.926945282326866
1992	18.11797172821242
1993	18.674300589697975
1994	27.350861887937864
1995	18.065230788374834
1996	18.17392152373133
1997	17.68441522166529
1998	17.30333987884008
1999	17.163085788364498
2000	16.407017363121746
2001	15.93145828915504
2002	15.451096947737064
2003	15.028989848718913
2004	14.577009807890736
2005	14.143570058951603
2006	13.722684735112493
2007	13.304041754397588
2008	13.061367081864207
2009	12.6238180307764
2010	12.299682481832681
2011	12.037278644502983
2012	11.789898709293844
2013	11.5698080438222
2014	11.327976217190129
2015	11.080101035184734
2016	10.841346763325241
2017	10.598641133310661
2018	10.3689928164056
2019	10.1225371219343
2020	9.912448698111612
2021	9.706832118806574
2022	9.533830917688833