Year	Number
1996	20.218578338623
1998	21.3114757537842
2000	20.218578338623
2002	25.9459457397461
2003	28.6486492156982
2004	33.3333320617676
2005	24.0196075439453
2006	20
2007	18.4466018676758
2008	17.9611644744873
2009	19.6172256469727
2010	16.2679424285889
2011	15.6398105621338
2012	14.2180099487305
2013	17.5355453491211
2014	15.865385055542
2015	14.2857141494751
2016	13.8095235824585
2017	12.8571424484253
2018	15.2380952835083
2019	19.5238094329834
2020	21.4285717010498
2021	19.0476188659668
2022	22.1698112487793