Year	per 1,000
1990	5.618088695532153
1991	5.477259672891778
1992	5.339087179531588
1993	5.27200240871342
1994	5.147026330169267
1995	5.016777614750874
1996	4.846952876278908
1997	4.647678352063086
1998	4.454785043583749
1999	4.335289395624695
2000	4.165079190219265
2001	3.994124188830576
2002	3.897007340213531
2003	3.7838954432525647
2004	3.885265241909284
2005	3.472642797293461
2006	3.293131677088607
2007	3.220483079793259
2008	3.3564636711511837
2009	3.105632231356046
2010	3.0653181046220697
2011	3.0172972735793113
2012	2.9386921549087663
2013	2.9237006981605225
2014	2.850423724118505
2015	2.8215131790785137
2016	2.74293455821164
2017	2.723077157427745
2018	2.6322546669475346
2019	2.5996775546535362
2020	2.48813936085569
2021	2.478910839865458
2022	2.4483712755057674