Year	Number
1996	3.82513666152954
1998	4.37158489227295
2000	2.7322404384613
2002	8.10810852050781
2003	12.972972869873
2004	10.4477615356445
2005	12.2549018859863
2006	10.2439022064209
2007	10.1941747665405
2008	13.1067962646484
2009	14.8325357437134
2010	15.7894735336304
2011	17.0616111755371
2012	15.1658763885498
2013	15.1658763885498
2014	15.865385055542
2015	14.2857141494751
2016	14.7619047164917
2017	13.3333330154419
2018	11.4285717010498
2019	10.9523811340332
2020	14.7619047164917
2021	13.8095235824585
2022	14.6226415634155