Year	Number
1996	18.6170215606689
1998	21.8085098266602
2000	24.8677253723145
2002	26.9841270446777
2003	29.1457290649414
2004	26.2135925292969
2005	16.990291595459
2006	22.7053146362305
2007	28.5024147033691
2008	25.480770111084
2009	28.4360198974609
2010	26.5402851104736
2011	19.4312801361084
2012	20.8530807495117
2013	19.4312801361084
2014	18.5714282989502
2015	19.5238094329834
2016	16.6666660308838
2017	22.8571434020996
2018	19.3396224975586
2019	22.6415100097656
2020	30.6603775024414
2021	19.3396224975586
2022	22.1698112487793