Year	per 1,000
1990	10.65766171510367
1991	10.548353187514607
1992	9.955927719810909
1993	9.662013946636263
1994	9.563004996016065
1995	8.982434187623573
1996	8.693500972802124
1997	8.46098442925444
1998	8.23122197351143
1999	7.960284053372538
2000	7.746930021826454
2001	7.522221431695557
2002	7.319492525141697
2003	7.141734984964124
2004	7.112354650668138
2005	6.789959849819747
2006	6.461889760192611
2007	6.245118616641573
2008	6.2593587675548
2009	5.79056501750506
2010	5.6367327124278965
2011	5.341480359262009
2012	5.1566336523918155
2013	4.968213418515172
2014	4.7650212865845845
2015	4.588511156091159
2016	4.404255935952028
2017	4.265036912722515
2018	4.130043567588503
2019	3.983900209205266
2020	3.8738860253759806
2021	3.775114758373885
2022	3.665123769536817