Year	Number
1982	0.8066534517675789
1983	0.9164978267448483
1984	0.9757664773880629
1985	1.1279954623042283
1986	2.3037705004179867
1987	3.871061213429956
1988	4.183291848507027
1989	3.9634310445964798
1990	3.3131064409482303
1991	3.183986845874977
1992	3.6101209633918323
1993	3.9595302503654772
1994	3.3631483661227106
1995	3.5227236011021272
1996	3.1914878522577013
1997	2.786815159005624
1998	3.299550784621784
1999	2.7170476888795845
2000	2.6123732816712923
2001	2.624466165020298
2002	2.6724560119878493
2003	2.7521481432492463
2004	3.304961365546281
2005	3.118603331937624
2006	4.639077885184576
2007	4.5838200322072815
2008	2.8059638403089284
2009	5.161674126715191
2010	4.530790136050446
2011	4.470613131028858
2012	4.560608014362327
2013	4.7738919044683765
2014	4.916854444315805
2015	6.27445326534027
2016	6.171094279345655
2017	8.464357894414011
2018	8.988310295791171
2019	11.363382987244243
2020	15.454354180286675
2021	14.189092933876735
2022	12.595651064993277