Year	Number
1996	18.0904521942139
1998	12.5
2000	10.4477615356445
2002	5.47263669967651
2003	7.46268653869629
2004	8.65384578704834
2005	9.56937789916992
2006	9.56937789916992
2007	9.09090900421143
2008	9.61538505554199
2009	13.7440757751465
2010	13.2701425552368
2011	15.023473739624
2012	14.5539903640747
2013	15.023473739624
2014	18.269229888916
2015	17.619047164917
2016	16.6666660308838
2017	16.6666660308838
2018	19.0476188659668
2019	21.9047622680664
2020	26.1904754638672
2021	21.4285717010498
2022	20.2830181121826