Year	Number
1996	34.042552947998
1998	25
2000	30.1587295532227
2002	23.8095245361328
2003	19.0954780578613
2004	20.8737869262695
2005	28.1553401947021
2006	26.0869560241699
2007	21.2560386657715
2008	22.115385055542
2009	17.5355453491211
2010	19.4312801361084
2011	19.4312801361084
2012	18.4834117889404
2013	19.4312801361084
2014	23.3333339691162
2015	23.8095245361328
2016	24.2857151031494
2017	30
2018	23.5849056243896
2019	28.301887512207
2020	26.8867931365967
2021	33.9622650146484
2022	39.1509437561035