Year	per 1,000
1990	17.529728620926967
1991	17.156198442076274
1992	17.11666456840568
1993	17.278444918865794
1994	22.26554893637452
1995	16.656811782734167
1996	16.59115136498817
1997	16.170633535874163
1998	15.845978902029387
1999	15.658886732849652
2000	15.102544062165942
2001	14.731813872861814
2002	14.363030102547478
2003	14.038462507944033
2004	13.680329315771047
2005	13.32547349088725
2006	12.983511442406634
2007	12.627751804461283
2008	12.396388278765777
2009	12.02668960468518
2010	11.746730649438584
2011	11.512446024971545
2012	11.280287928406779
2013	11.096583376036447
2014	10.876162874928816
2015	10.677946128593714
2016	10.447431463555503
2017	10.227401417620664
2018	9.995305817161894
2019	9.768363699583725
2020	9.53740072004551
2021	9.328376408202471
2022	9.154220137203295