Year	per 1,000
1990	6.261061217812231
1991	6.091878343351414
1992	5.975061095808926
1993	5.959638215400087
1994	5.918420799194134
1995	5.877679171752771
1996	5.831827909510282
1997	5.755151632117589
1998	5.799045041486114
1999	5.6433887418287725
2000	5.567043799481439
2001	5.485885247355588
2002	5.391347588202711
2003	5.265661368350701
2004	5.167349605380734
2005	5.084714486161951
2006	5.026175539521936
2007	5.003964169992231
2008	5.080007588457582
2009	5.109707118418157
2010	5.823151930308382
2011	5.117168569851095
2012	5.068134240619068
2013	5.027875849838949
2014	5.000558257961288
2015	4.988243291559131
2016	4.921759167293927
2017	4.809364854600102
2018	4.679488019884314
2019	4.536394528044493
2020	4.378778269661858
2021	4.249822691650663
2022	4.161279254372051