Year	per 1,000
1990	17.53174336688553
1991	17.158134515326402
1992	17.118500909044606
1993	17.280245417992322
1994	22.267925504996068
1995	16.658429961426965
1996	16.59272744670586
1997	16.17210154490694
1998	15.847335975200032
1999	15.660150167006092
2000	15.1036831138264
2001	14.732837806242598
2002	14.364010289721568
2003	14.03937898778897
2004	13.68118360675113
2005	13.326282153454558
2006	12.98428521429462
2007	12.628476880097042
2008	12.39708896089143
2009	12.027356841890857
2010	11.74737999315278
2011	11.513036220270214
2012	11.280843447619487
2013	11.097095172622032
2014	10.876621962495449
2015	10.678354629681687
2016	10.447794055230762
2017	10.227726709532797
2018	9.995608289004325
2019	9.768645877185774
2020	9.537670015002753
2021	9.328636173617074
2022	9.154523708636614