Year	Number
1996	27.6381912231445
1998	26
2000	26.3681583404541
2002	30.348258972168
2003	38.8059692382813
2004	40.8653831481934
2005	41.1483268737793
2006	40.1913871765137
2007	41.6267929077148
2008	42.3076934814453
2009	44.5497627258301
2010	42.6540298461914
2011	43.1924896240234
2012	40.3755874633789
2013	42.7230033874512
2014	33.6538467407227
2015	32.3809509277344
2016	28.5714282989502
2017	29.5238094329834
2018	28.0952377319336
2019	29.0476188659668
2020	32.3809509277344
2021	33.8095245361328
2022	36.7924537658691