Year	Number
1998	9.95024871826172
2000	18.9054718017578
2002	33.3333320617676
2003	39.3034820556641
2004	37.019229888916
2005	40.3846168518066
2006	46.6346168518066
2007	47.1153831481934
2008	48.5576934814453
2009	48.8151664733887
2010	48.3412322998047
2011	47.8873252868652
2012	48.8262901306152
2013	46.948356628418
2014	45.8128089904785
2015	43.3497543334961
2016	41.3793106079102
2017	42.3645324707031
2018	38.3495140075684
2019	39.1304359436035
2020	39.1304359436035
2021	45.4106292724609
2022	49.2753639221191