Year	Number
1996	20.7446804046631
1998	18.6170215606689
2000	33.862434387207
2002	42.3280410766602
2003	29.6482410430908
2004	22.3300971984863
2005	25.7281551361084
2006	25.1207733154297
2007	22.2222213745117
2008	23.0769233703613
2009	36.9668235778809
2010	33.1753540039063
2011	29.8578205108643
2012	36.9668235778809
2013	25.1184825897217
2014	30
2015	22.8571434020996
2016	21.4285717010498
2017	17.1428565979004
2018	19.3396224975586
2019	12.7358493804932
2020	19.3396224975586
2021	18.8679237365723
2022	21.698112487793