Year	Number
1996	12.0603017807007
1998	13
2000	14.9253730773926
2002	6.46766185760498
2003	6.96517419815063
2004	6.25
2005	6.69856452941895
2006	10.0478467941284
2007	9.09090900421143
2008	8.65384578704834
2009	9.00473976135254
2010	8.53080558776855
2011	11.7370891571045
2012	12.6760559082031
2013	15.023473739624
2014	15.865385055542
2015	13.3333330154419
2016	30
2017	27.1428565979004
2018	22.380952835083
2019	21.9047622680664
2020	18.5714282989502
2021	10.9523811340332
2022	10.8490562438965