Year	Number
1996	22.8723411560059
1998	19.1489353179932
2000	21.1640205383301
2002	21.6931209564209
2003	11.0552759170532
2004	15.5339803695679
2005	9.70873832702637
2006	13.5265703201294
2007	11.1111106872559
2008	14.4230766296387
2009	18.9573459625244
2010	21.3270149230957
2011	20.3791465759277
2012	20.3791465759277
2013	23.222749710083
2014	23.8095245361328
2015	25.7142848968506
2016	24.761905670166
2017	24.2857151031494
2018	23.5849056243896
2019	12.7358493804932
2020	18.3962268829346
2021	23.5849056243896
2022	22.1698112487793