Year	Number
1996	12.5683059692383
1998	9.8360652923584
2000	10.382513999939
2002	6.48648643493652
2003	20.5405406951904
2004	24.8756217956543
2005	14.2156858444214
2006	27.3170738220215
2007	23.3009700775146
2008	21.8446598052979
2009	20.5741634368896
2010	20.5741634368896
2011	19.9052124023438
2012	19.9052124023438
2013	18.0094795227051
2014	16.8269233703613
2015	14.2857141494751
2016	16.6666660308838
2017	17.619047164917
2018	17.1428565979004
2019	18.5714282989502
2020	24.761905670166
2021	19.0476188659668
2022	20.7547168731689