Year	per 1,000
1990	6.136287257911757
1991	5.992658242253962
1992	5.899364925217283
1993	5.897405071552778
1994	5.860337518703894
1995	5.82026056065666
1996	5.757717717026047
1997	5.67204566212494
1998	5.717687909171044
1999	5.592456789381051
2000	5.557261353142865
2001	5.52273098505523
2002	5.470448168900312
2003	5.368922380681588
2004	5.278509915712536
2005	5.2067203735359175
2006	5.170718935854544
2007	5.180050211707249
2008	5.277290439442704
2009	5.315813100027787
2010	5.980275661103168
2011	5.326789400806869
2012	5.281187428754331
2013	5.253451290940772
2014	5.243886165631867
2015	5.248638082092681
2016	5.202282639670394
2017	5.119079979439214
2018	4.992322839704732
2019	4.836356733779616
2020	4.683274867228662
2021	4.563239550277846
2022	4.482190660782028