Year	Number
1996	3.76344084739685
1998	3.20855617523193
2000	2.12765955924988
2002	5.8201060295105
2003	14.8148145675659
2004	11.822660446167
2005	11.2195119857788
2006	13.6585369110107
2007	16.019416809082
2008	15.5339803695679
2009	17.7033500671387
2010	14.2857141494751
2011	11.3744077682495
2012	7.10900497436523
2013	9.95260620117188
2014	10.0961542129517
2015	12.380952835083
2016	11.4285717010498
2017	10.9523811340332
2018	11.4285717010498
2019	10.9523811340332
2020	12.380952835083
2021	13.3333330154419
2022	13.2075471878052