Year	Number
1996	15.5778894424438
1998	14
2000	12.4378108978271
2002	16.9154224395752
2003	20.3980102539063
2004	16.8269233703613
2005	16.2679424285889
2006	20.5741634368896
2007	20.5741634368896
2008	18.75
2009	27.962085723877
2010	28.4360198974609
2011	31.4553985595703
2012	20.1877937316895
2013	19.2488269805908
2014	17.3076915740967
2015	21.4285717010498
2016	17.619047164917
2017	16.1904754638672
2018	19.5238094329834
2019	21.9047622680664
2020	21.4285717010498
2021	25.7142848968506
2022	24.056604385376