Year	Number
1996	20.7446804046631
1998	29.2553195953369
2000	25.3968257904053
2002	20.1058197021484
2003	18.5929641723633
2004	20.3883495330811
2005	19.4174766540527
2006	25.1207733154297
2007	27.0531406402588
2008	29.3269233703613
2009	25.5924167633057
2010	25.5924167633057
2011	28.4360198974609
2012	29.8578205108643
2013	29.8578205108643
2014	24.2857151031494
2015	28.5714282989502
2016	31.9047622680664
2017	38.5714302062988
2018	33.4905662536621
2019	33.4905662536621
2020	32.0754699707031
2021	26.4150943756104
2022	29.7169818878174