Year	per 1,000
1990	5.340395285584769
1991	5.178917318587536
1992	5.013778422066445
1993	4.86695856884981
1994	4.724480175032662
1995	4.5822341038988545
1996	4.43852338839237
1997	4.31070765733022
1998	4.138064385037399
1999	4.033724617841661
2000	3.8946544906583878
2001	3.7670600745483513
2002	3.8167284824780277
2003	3.5462563503999163
2004	3.4301751330502905
2005	3.352081575351161
2006	3.2529740054317005
2007	3.3069253150833955
2008	3.0443866499723202
2009	3.330868702719507
2010	2.873697405671665
2011	2.7800178779918263
2012	2.7322104314926583
2013	2.6685387147458
2014	2.6166180543383
2015	2.5652742452725863
2016	2.660497133888358
2017	2.5204245545892086
2018	2.4596012145681216
2019	2.4103345727377548
2020	2.536109022060376
2021	2.3263328868818594
2022	2.2674434035909443