Year	Number
1996	21.3114757537842
1998	20.7650279998779
2000	15.3005466461182
2002	10.2702703475952
2003	14.5945949554443
2004	16.9154224395752
2005	15.6862745285034
2006	19.0243911743164
2007	20.8737869262695
2008	16.990291595459
2009	18.6602878570557
2010	21.0526313781738
2011	20.3791465759277
2012	22.274881362915
2013	25.1184825897217
2014	25.9615383148193
2015	29.0476188659668
2016	27.1428565979004
2017	26.6666660308838
2018	21.9047622680664
2019	25.238094329834
2020	24.761905670166
2021	28.5714282989502
2022	28.7735843658447