Year	per 1,000
1990	25.55387198447628
1991	25.136922181146804
1992	25.36527484502445
1993	26.10726014166343
1994	38.17463272101963
1995	25.752129958115606
1996	26.293177763357207
1997	25.563098781613043
1998	25.190267870547004
1999	25.51599842486908
2000	24.147272425512455
2001	23.550350583940915
2002	22.945572434695798
2003	22.288704224805677
2004	21.594853537010742
2005	20.86589291003274
2006	20.089935875858096
2007	19.31290247632049
2008	18.76141153613514
2009	17.769959685471846
2010	17.072050033108553
2011	16.404034335017673
2012	15.812859573044951
2013	15.301958726187308
2014	14.86006294443123
2015	14.44579501429744
2016	14.134560428927797
2017	13.80841815664838
2018	13.557427499975429
2019	13.349381367369084
2020	13.164710285368063
2021	13.003288990212052
2022	12.958468661788894