Year	Number
1983	8.105309657950656
1984	9.584611667933277
1985	3.2532882920048096
1986	4.69839553928599
1987	6.439219178629016
1988	6.188942626569981
1989	4.78915970249545
1990	2.608281387270055
1991	2.683845844598225
1992	2.7363533255635444
1993	2.9354947147621084
1994	3.341257530921554
1995	3.2523561800282548
1996	3.1316005204829835
1997	3.456932015083089
1998	3.4459129677176676
1999	3.3832829176223655
2000	3.598702029429928
2001	5.009929076850316
2002	2.6010623002907067
2003	2.7130101468429166
2004	2.372400389698712
2005	2.02853077465431
2006	2.037062142776584
2007	1.7360640005808408
2008	1.8312507763522365
2009	1.7563852001269316
2010	2.0643253611504715
2011	2.794511650255183
2012	3.4327396032159085
2013	4.916830102746765
2014	4.326685072983447
2015	6.45327943059477
2016	4.117837893472281
2017	3.3156589129841074
2018	2.406738839848204
2019	2.6073212662718674
2020	3.37386285248052
2021	3.7659206523912765
2022	4.483819242060088
2023	9.838541575270122