Year	Number
1993	9.170993780438437
1994	2.286653362381456
1995	1.3964612692628002
1996	1.0570996637523493
1997	1.0317088428430505
1998	0.9652258475971067
1999	1.1451870682246705
2000	1.3307757406151415
2001	1.5137932997332004
2002	1.5037085228212193
2003	1.3092596649527326
2004	1.3075905631433729
2005	2.198529342234664
2006	1.5248705484215026
2007	2.141475601219406
2008	2.6201537814440887
2009	2.189636902538271
2010	2.036719799181744
2011	2.2766617724601192
2012	2.493681799058318
2013	3.087628249979885
2014	2.4423753472166574
2015	2.772883279676939
2016	1.9546477397695243
2017	1.9410756502452065
2018	1.9492156024563188
2019	1.9237826732316665
2020	1.6931442160356647
2021	2.0557030490892916
2022	2.1248026256771197
2023	2.334637766813647