Year	Number
1996	35
1998	40.2985076904297
2000	34.825870513916
2002	37.8109436035156
2003	36.3184089660645
2004	38.9423065185547
2005	38.461540222168
2006	40.8653831481934
2007	42.3076934814453
2008	42.788459777832
2009	42.6540298461914
2010	42.6540298461914
2011	46.948356628418
2012	46.0093879699707
2013	45.5399055480957
2014	47.7832527160645
2015	47.7832527160645
2016	49.7536964416504
2017	49.2610855102539
2018	52.4271850585938
2019	53.6231880187988
2020	53.1400947570801
2021	51.2077293395996
2022	54.5893707275391