Year	Number
1996	38.2513656616211
1998	22.4043712615967
2000	20.7650279998779
2002	25.9459457397461
2003	21.6216220855713
2004	20.8955230712891
2005	24.0196075439453
2006	18.536584854126
2007	20.8737869262695
2008	20.3883495330811
2009	20.5741634368896
2010	19.6172256469727
2011	17.5355453491211
2012	18.9573459625244
2013	20.3791465759277
2014	15.384614944458
2015	12.380952835083
2016	10
2017	9.0476188659668
2018	9.0476188659668
2019	10
2020	11.9047622680664
2021	12.380952835083
2022	12.7358493804932