Year	Number
1996	30
1998	34.3283576965332
2000	33.3333320617676
2002	38.3084564208984
2003	37.3134346008301
2004	32.6923065185547
2005	37.019229888916
2006	39.9038467407227
2007	44.230770111084
2008	42.3076934814453
2009	42.1800956726074
2010	43.1279602050781
2011	43.6619720458984
2012	43.1924896240234
2013	42.2535209655762
2014	41.3793106079102
2015	38.9162559509277
2016	39.4088668823242
2017	37.9310340881348
2018	33.4951438903809
2019	31.4009666442871
2020	28.9855079650879
2021	29.468599319458
2022	29.9516906738281