Year	Number
1996	19.1256828308105
1998	20.7650279998779
2000	20.7650279998779
2002	20.5405406951904
2003	20.5405406951904
2004	20.8955230712891
2005	26.470588684082
2006	29.7560977935791
2007	21.8446598052979
2008	13.1067962646484
2009	11.4832534790039
2010	12.9186601638794
2011	11.3744077682495
2012	13.2701425552368
2013	12.7962083816528
2014	13.942307472229
2015	13.8095235824585
2016	13.8095235824585
2017	15.2380952835083
2018	14.2857141494751
2019	13.3333330154419
2020	16.6666660308838
2021	18.0952377319336
2022	14.1509437561035