Year	Number
1996	21.3114757537842
1998	16.3934421539307
2000	15.3005466461182
2002	8.64864826202393
2003	12.972972869873
2004	8.4577112197876
2005	12.2549018859863
2006	9.7560977935791
2007	6.31067943572998
2008	7.28155326843262
2009	6.22009563446045
2010	6.69856452941895
2011	8.05687236785889
2012	9.95260620117188
2013	12.7962083816528
2014	12.0192308425903
2015	10
2016	12.380952835083
2017	15.2380952835083
2018	11.4285717010498
2019	10.9523811340332
2020	11.9047622680664
2021	10.4761905670166
2022	6.60377359390259