Year	Number
1996	41.5
1998	41.2935333251953
2000	39.8009948730469
2002	39.8009948730469
2003	38.3084564208984
2004	39.9038467407227
2005	33.6538467407227
2006	30.769229888916
2007	32.211540222168
2008	30.2884616851807
2009	31.7535552978516
2010	30.3317527770996
2011	30.046947479248
2012	27.6995296478271
2013	28.1690139770508
2014	28.5714282989502
2015	28.0788173675537
2016	29.0640392303467
2017	30.5418720245361
2018	30.0970878601074
2019	28.5024147033691
2020	29.9516906738281
2021	29.9516906738281
2022	29.468599319458