Year	Number
1996	4.89130449295044
1998	8.69565200805664
2000	9.2391300201416
2002	12.4324321746826
2003	15.1351346969604
2004	16.9154224395752
2005	25
2006	21.5686283111572
2007	20.8737869262695
2008	23.3009700775146
2009	23.4449768066406
2010	22.4880390167236
2011	22.274881362915
2012	21.3270149230957
2013	21.8009471893311
2014	14.9038457870483
2015	12.8571424484253
2016	12.8571424484253
2017	13.3333330154419
2018	13.8095235824585
2019	12.8571424484253
2020	10.9523811340332
2021	12.8571424484253
2022	15.5660381317139