Year	per 1,000
1990	2.4082192947384304
1991	2.412722165683132
1992	2.6045442194875177
1993	2.5893815694384896
1994	2.457881775049854
1995	2.4665560413988863
1996	2.428696344525966
1997	2.3617094261207043
1998	2.3128876955024835
1999	2.6127608692468414
2000	2.201601631544321
2001	2.1545245353346836
2002	2.1176677926479455
2003	2.0816447215671796
2004	2.019622029609559
2005	1.9676557035359037
2006	1.9477959969057717
2007	1.865643390958803
2008	1.8102447094761671
2009	1.749205097685504
2010	1.6594369998162979
2011	1.6045030999174918
2012	1.5165890588833724
2013	1.46879020564556
2014	1.4062662786861546
2015	1.3631245771911802
2016	1.3064672737364513
2017	1.3068017314736546
2018	1.2835063753677889
2019	1.2222775710413378
2020	1.218670413142082
2021	1.1873753390815016
2022	1.2692219250264882