Year	Number
1996	3.22580647468567
1998	1.06951868534088
2000	3.72340416908264
2002	3.70370364189148
2003	5.29100513458252
2004	7.38916254043579
2005	10.2439022064209
2006	5.36585378646851
2007	5.33980560302734
2008	4.36893224716187
2009	3.82775115966797
2010	6.66666650772095
2011	4.26540279388428
2012	7.10900497436523
2013	6.16113758087158
2014	11.057692527771
2015	15.2380952835083
2016	14.7619047164917
2017	15.7142858505249
2018	15.7142858505249
2019	16.6666660308838
2020	17.619047164917
2021	18.5714282989502
2022	20.2830181121826