Year	per 1,000
1990	10.818841220133642
1991	11.575434342000275
1992	10.441053892493692
1993	10.489878735052326
1994	12.2441543572093
1995	9.756437501673082
1996	9.546739536709438
1997	9.2593403636848
1998	8.940029187752321
1999	8.535323372289945
2000	8.208018955888422
2001	7.955148420997614
2002	7.719122548894084
2003	7.532984988623844
2004	7.37105681208124
2005	7.221924079966966
2006	7.05643226044498
2007	6.877095963021122
2008	7.224452320743668
2009	6.4622520597580335
2010	6.638160296044873
2011	6.041962063081661
2012	5.835477779193842
2013	5.6821966590421535
2014	5.52991184713137
2015	5.461195460464261
2016	5.319856468507882
2017	5.2475504687375745
2018	5.184330854737592
2019	5.12796596676027
2020	5.0885655906768585
2021	5.03175462860598
2022	4.9467321542952645