Year	Number
1996	31.6582908630371
1998	25.5
2000	19.4029846191406
2002	20.8955230712891
2003	20.3980102539063
2004	17.3076915740967
2005	21.5311012268066
2006	23.4449768066406
2007	21.0526313781738
2008	18.269229888916
2009	22.274881362915
2010	28.4360198974609
2011	19.7183094024658
2012	21.1267604827881
2013	22.0657272338867
2014	25.9615383148193
2015	24.2857151031494
2016	20.4761905670166
2017	23.8095245361328
2018	26.6666660308838
2019	25.7142848968506
2020	24.761905670166
2021	27.619047164917
2022	25