Year	Number
1996	12.9032258987427
1998	9.6256685256958
2000	8.51063823699951
2002	6.34920644760132
2003	10.582010269165
2004	15.2709360122681
2005	16.0975608825684
2006	14.6341466903687
2007	14.0776700973511
2008	17.9611644744873
2009	17.2248802185059
2010	16.6666660308838
2011	18.9573459625244
2012	26.5402851104736
2013	24.6445503234863
2014	15.384614944458
2015	18.0952377319336
2016	16.1904754638672
2017	20.4761905670166
2018	21.9047622680664
2019	26.1904754638672
2020	25.7142848968506
2021	20.9523811340332
2022	20.2830181121826