Year	Number
1996	2.68817210197449
1998	1.06951868534088
2000	5.31914901733398
2002	5.8201060295105
2003	6.87830686569214
2004	15.2709360122681
2005	13.6585369110107
2006	16.0975608825684
2007	18.4466018676758
2008	20.3883495330811
2009	22.4880390167236
2010	23.3333339691162
2011	18.9573459625244
2012	17.0616111755371
2013	16.5876770019531
2014	23.5576915740967
2015	25.238094329834
2016	27.619047164917
2017	27.1428565979004
2018	24.2857151031494
2019	24.2857151031494
2020	22.8571434020996
2021	21.4285717010498
2022	26.8867931365967