Year	per 1,000
1990	16.852016456879923
1991	17.116443819243532
1992	16.43960782164505
1993	16.66540708899692
1994	21.713276734414002
1995	16.03116723169682
1996	15.85454518856053
1997	15.222203996573151
1998	14.601706232333397
1999	14.141309970477018
2000	13.428428696396258
2001	13.004933107151313
2002	12.662166998036142
2003	12.358372945602301
2004	12.06788130280016
2005	11.773963871935246
2006	11.493268897739256
2007	11.203691491930973
2008	11.377675148415245
2009	10.66795175135895
2010	10.812841352698777
2011	10.266248207824294
2012	10.15156708984097
2013	10.07977008371992
2014	10.050987095915668
2015	10.081388386001185
2016	9.925818431527594
2017	9.77760575451065
2018	9.605859728150595
2019	9.302438588237203
2020	9.003215503890502
2021	8.770032744270804
2022	8.52521938576317