Year	Number
1996	6.01092910766602
1998	3.82513666152954
2000	3.27868843078613
2002	10.2702703475952
2003	12.972972869873
2004	10.4477615356445
2005	14.2156858444214
2006	14.1463413238525
2007	15.0485439300537
2008	12.62135887146
2009	13.3971290588379
2010	11.0047845840454
2011	12.7962083816528
2012	8.05687236785889
2013	11.3744077682495
2014	6.73076915740967
2015	9.5238094329834
2016	7.14285707473755
2017	8.5714282989502
2018	8.09523773193359
2019	7.61904764175415
2020	6.1904764175415
2021	6.1904764175415
2022	6.13207530975342