Year	Number
1996	11.702127456665
1998	15.957447052002
2000	25.9259262084961
2002	30.1587295532227
2003	35.1758804321289
2004	35.4368934631348
2005	30.5825233459473
2006	29.468599319458
2007	42.9951705932617
2008	43.75
2009	28.9099521636963
2010	22.274881362915
2011	23.222749710083
2012	33.6492881774902
2013	19.4312801361084
2014	8.09523773193359
2015	7.61904764175415
2016	13.3333330154419
2017	17.1428565979004
2018	20.7547168731689
2019	22.6415100097656
2020	20.2830181121826
2021	17.9245281219482
2022	17.4528293609619