Year	per 1,000
1990	2.239068984432633
1991	2.181556567697453
1992	2.14274172620138
1993	2.1003519059347426
1994	2.096505007467609
1995	2.052275240954337
1996	2.062133656026024
1997	2.039920263412859
1998	2.039699744549968
1999	2.03981757547649
2000	2.046851779285795
2001	2.0727299511144737
2002	2.073654255127419
2003	2.0573723483751483
2004	2.0728811631296433
2005	2.0663363636685594
2006	2.1044269911191065
2007	2.074859380992287
2008	2.0887985665584936
2009	2.076465732276486
2010	2.0577936969949286
2011	2.064595696391011
2012	2.0129933017075725
2013	1.9984233571270882
2014	1.987111437657475
2015	1.93253434022198
2016	1.9111163608187025
2017	1.9696205657323902
2018	1.8573569684101774
2019	2.2459532117999523
2020	1.8173003396039225
2021	1.7931626757287675
2022	1.7615747647074778