Year	per 1,000
1990	26.017110404123144
1991	24.674009315482493
1992	24.492488368292637
1993	24.72042456989619
1994	34.77331521547202
1995	23.63166049946852
1996	23.65391534774354
1997	22.691909212057485
1998	22.19635891671988
1999	22.124177137290722
2000	20.749725595994242
2001	20.05399198797787
2002	19.392255096320362
2003	18.765552860001403
2004	18.105639022577833
2005	17.519154762095084
2006	16.973308812279964
2007	16.493507097218735
2008	16.226949679471442
2009	15.610144329003539
2010	15.807425874136976
2011	14.906589148543736
2012	14.594710810379938
2013	14.323635722539175
2014	14.100113979256907
2015	13.872207445999994
2016	13.679279692340563
2017	13.474041362835996
2018	13.255476748641904
2019	13.096145881292939
2020	12.908441458479787
2021	12.754940786314757
2022	12.748515785418077