Year	per 1,000
1990	23.661878506549513
1991	22.907518964985265
1992	22.94029371645296
1993	23.279260138930823
1994	30.480031788454504
1995	22.86228743637461
1996	23.010282599024993
1997	22.422478370424113
1998	22.11519264640088
1999	22.178719757205066
2000	21.246086169785567
2001	20.781263104511652
2002	20.32947196899995
2003	19.847562298018893
2004	19.306488853283494
2005	18.751038528397412
2006	18.18763233079655
2007	17.620523774158436
2008	17.183486217916084
2009	16.46645863305971
2010	15.933039182848972
2011	15.419683659189097
2012	14.94980815290389
2013	14.511811498318085
2014	14.145485040751543
2015	13.80601995167696
2016	13.497092183074773
2017	13.218616194634228
2018	12.955505589821628
2019	12.768746250910201
2020	12.585751781458114
2021	12.443227844272661
2022	12.395767263887238