Year	Number
1996	17.3913040161133
1998	20.1086959838867
2000	16.3043479919434
2002	18.9189186096191
2003	20.5405406951904
2004	20.8955230712891
2005	21.0784320831299
2006	20.5882358551025
2007	21.8446598052979
2008	24.2718448638916
2009	32.5358848571777
2010	33.0143547058105
2011	34.1232223510742
2012	36.0189590454102
2013	36.0189590454102
2014	31.730770111084
2015	27.1428565979004
2016	26.6666660308838
2017	27.619047164917
2018	28.5714282989502
2019	28.0952377319336
2020	30
2021	25.7142848968506
2022	21.2264156341553