Year	per 1,000
1990	6.834751564345273
1991	6.8406582174352115
1992	6.75775419468132
1993	6.671264531671558
1994	6.603899546828917
1995	6.5513491907342365
1996	6.408540327853824
1997	6.31033005595333
1998	6.178415129953493
1999	6.041863890248223
2000	5.901879766884918
2001	5.77306860535582
2002	5.6733261716602
2003	5.550803849562798
2004	5.463729238322955
2005	5.329545314066945
2006	5.238149073869666
2007	5.180374606178095
2008	5.114167121872092
2009	5.120099925031566
2010	5.087450966785361
2011	5.107194987366046
2012	5.163798707537725
2013	5.2451427739150125
2014	5.34839332157131
2015	5.490101596998149
2016	5.606598257759104
2017	5.658776858198396
2018	5.634357931568095
2019	5.630460275541858
2020	5.512248442232443
2021	5.408058188981598
2022	5.286148531086884