Year	per 1,000
1990	5.552048511770351
1991	5.597069029535113
1992	6.281608934854697
1993	6.413648304136154
1994	5.900287864701033
1995	5.535681703969287
1996	5.227184117520889
1997	4.963502472603314
1998	4.794240430502227
1999	4.943780168630715
2000	4.432442518756223
2001	4.202567096223464
2002	3.9872274954777684
2003	3.773340930242207
2004	3.5757102651959185
2005	3.45508110633921
2006	3.3593040799292995
2007	3.2463165171770196
2008	3.1340111034726483
2009	3.0058126138591774
2010	2.9073241217033496
2011	2.8366655674122088
2012	2.7576771039769157
2013	2.7028555170686444
2014	2.7389560706552083
2015	2.685464359051626
2016	2.6708237643333534
2017	2.5513497551403073
2018	2.4901354696926474
2019	2.4420283942671035
2020	2.5306819336066138
2021	2.495599818823747
2022	3.067122688339308