Year	Number
1996	20.5
1998	24.3781089782715
2000	15.9203977584839
2002	18.4079608917236
2003	12.93532371521
2004	16.3461532592773
2005	13.4615383148193
2006	18.75
2007	15.865385055542
2008	16.3461532592773
2009	16.5876770019531
2010	14.6919431686401
2011	15.962441444397
2012	16.4319248199463
2013	15.962441444397
2014	19.2118225097656
2015	16.2561569213867
2016	14.2857141494751
2017	14.2857141494751
2018	16.5048542022705
2019	17.3913040161133
2020	17.3913040161133
2021	19.8067626953125
2022	21.2560386657715