Year	Number
1996	12.2340421676636
1998	10.638298034668
2000	19.5767192840576
2002	17.4603176116943
2003	12.5628137588501
2004	18.9320392608643
2005	32.5242729187012
2006	25.1207733154297
2007	22.2222213745117
2008	23.5576915740967
2009	19.9052124023438
2010	19.9052124023438
2011	18.4834117889404
2012	18.0094795227051
2013	19.9052124023438
2014	17.1428565979004
2015	21.4285717010498
2016	20
2017	27.1428565979004
2018	28.7735843658447
2019	22.6415100097656
2020	28.301887512207
2021	24.056604385376
2022	32.0754699707031