Year	Number
1996	8.60215091705322
1998	0
2000	8.51063823699951
2002	1.58730161190033
2003	5.8201060295105
2004	9.85221672058105
2005	13.1707315444946
2006	14.1463413238525
2007	19.4174766540527
2008	19.4174766540527
2009	11.9617223739624
2010	16.1904754638672
2011	17.5355453491211
2012	18.9573459625244
2013	21.3270149230957
2014	23.5576915740967
2015	25.7142848968506
2016	28.0952377319336
2017	38.5714302062988
2018	35.7142868041992
2019	26.6666660308838
2020	27.1428565979004
2021	27.619047164917
2022	26.4150943756104