Year	Number
1996	14.1304349899292
1998	14.6739130020142
2000	14.6739130020142
2002	12.972972869873
2003	18.9189186096191
2004	19.4029846191406
2005	20.5882358551025
2006	18.6274509429932
2007	19.9029121398926
2008	18.9320392608643
2009	20.5741634368896
2010	19.1387557983398
2011	21.8009471893311
2012	18.4834117889404
2013	19.4312801361084
2014	18.269229888916
2015	24.2857151031494
2016	20.4761905670166
2017	23.8095245361328
2018	25.7142848968506
2019	26.6666660308838
2020	30.9523811340332
2021	24.761905670166
2022	21.2264156341553