Year	Number
1996	13
1998	16.9154224395752
2000	12.93532371521
2002	20.3980102539063
2003	20.8955230712891
2004	18.75
2005	19.230770111084
2006	18.75
2007	20.1923084259033
2008	21.634614944458
2009	21.3270149230957
2010	20.8530807495117
2011	20.1877937316895
2012	23.474178314209
2013	22.0657272338867
2014	21.674877166748
2015	22.1674880981445
2016	22.660099029541
2017	23.1527099609375
2018	27.6699028015137
2019	29.468599319458
2020	30.4347820281982
2021	29.9516906738281
2022	31.8840579986572