Year	Number
1996	17.3913040161133
1998	16.8478260040283
2000	19.0217399597168
2002	16.7567558288574
2003	18.3783779144287
2004	12.93532371521
2005	9.80392169952393
2006	14.2156858444214
2007	18.4466018676758
2008	16.990291595459
2009	22.0095691680908
2010	22.4880390167236
2011	23.222749710083
2012	23.222749710083
2013	23.222749710083
2014	28.365385055542
2015	19.5238094329834
2016	17.1428565979004
2017	14.2857141494751
2018	17.1428565979004
2019	16.6666660308838
2020	11.9047622680664
2021	10.4761905670166
2022	15.5660381317139