Year	Number
1996	12.0603017807007
1998	9.5
2000	2.98507452011108
2002	3.48258709907532
2003	6.46766185760498
2004	5.28846168518066
2005	4.30622005462646
2006	2.39234447479248
2007	5.26315784454346
2008	7.21153831481934
2009	7.5829381942749
2010	7.10900497436523
2011	6.1032862663269
2012	9.38967132568359
2013	13.1455402374268
2014	12.0192308425903
2015	11.9047622680664
2016	13.8095235824585
2017	10.4761905670166
2018	10.9523811340332
2019	12.380952835083
2020	7.61904764175415
2021	6.66666650772095
2022	6.13207530975342