Year	Number
1996	33.5
1998	39.8009948730469
2000	35.3233833312988
2002	36.8159217834473
2003	35.3233833312988
2004	29.8076915740967
2005	29.8076915740967
2006	34.6153831481934
2007	34.1346168518066
2008	32.211540222168
2009	28.9099521636963
2010	28.9099521636963
2011	28.6384983062744
2012	27.2300472259521
2013	27.6995296478271
2014	29.0640392303467
2015	28.0788173675537
2016	28.5714282989502
2017	28.5714282989502
2018	27.1844654083252
2019	25.1207733154297
2020	24.6376819610596
2021	25.6038646697998
2022	28.9855079650879