Year	Number
1996	45.1086959838867
1998	46.7391319274902
2000	41.3043479919434
2002	35.1351356506348
2003	22.7027034759521
2004	19.4029846191406
2005	15.6862745285034
2006	17.6470584869385
2007	17.4757289886475
2008	18.9320392608643
2009	16.7464122772217
2010	19.1387557983398
2011	20.3791465759277
2012	24.6445503234863
2013	21.8009471893311
2014	12.5
2015	10.9523811340332
2016	10.4761905670166
2017	10.4761905670166
2018	10.9523811340332
2019	10.9523811340332
2020	10.4761905670166
2021	9.5238094329834
2022	11.7924528121948