Year	per 1,000
1990	23.433517847405415
1991	24.442214209043534
1992	22.099737329919382
1993	21.701034417109273
1994	22.218194450953323
1995	19.959873899702803
1996	19.23589797633961
1997	18.396057318622084
1998	17.656511637919042
1999	16.4819879117496
2000	15.650263092654935
2001	14.94846963924791
2002	14.281614991717039
2003	13.71234225145925
2004	13.329826891686762
2005	12.652759444832887
2006	12.12816538969268
2007	11.605028635196211
2008	11.982312473760627
2009	10.602223566270824
2010	10.478817907675884
2011	9.698703381549107
2012	9.404833248092144
2013	9.073028454080951
2014	8.768915966514983
2015	8.549284009451434
2016	8.222801384072252
2017	8.029750550990057
2018	7.881545321303626
2019	7.617628750879727
2020	7.427895569067979
2021	7.284140982114793
2022	7.0908930940227375