Year	Number
1996	23.9361705780029
1998	18.0851058959961
2000	15.3439149856567
2002	20.1058197021484
2003	26.6331653594971
2004	29.1262130737305
2005	33.980583190918
2006	31.4009666442871
2007	25.1207733154297
2008	24.0384616851807
2009	19.9052124023438
2010	20.8530807495117
2011	25.5924167633057
2012	27.488151550293
2013	21.3270149230957
2014	20.9523811340332
2015	19.5238094329834
2016	28.0952377319336
2017	20.4761905670166
2018	15.0943393707275
2019	14.6226415634155
2020	12.7358493804932
2021	6.60377359390259
2022	6.60377359390259