Year	Number
1996	11.557788848877
1998	12
2000	14.9253730773926
2002	14.4278602600098
2003	4.47761201858521
2004	7.692307472229
2005	4.78468894958496
2006	2.87081336975098
2007	4.30622005462646
2008	2.4038462638855
2009	3.79146909713745
2010	3.3175356388092
2011	2.81690144538879
2012	3.28638505935669
2013	5.16431903839111
2014	9.61538505554199
2015	8.5714282989502
2016	7.14285707473755
2017	8.5714282989502
2018	7.14285707473755
2019	6.66666650772095
2020	7.14285707473755
2021	7.61904764175415
2022	8.01886749267578