Year	Number
1996	37.633107454
1997	32.4116650532
1998	27.1902226525
1999	21.9687802517
2000	16.7473378509
2001	16.0358180058
2002	15.3242981607
2003	19.5482413682
2004	23.7721845757
2005	27.9961277832
2006	20.6679574056
2007	13.3397870281
2008	19.3405130687
2009	25.3412391094
2010	21.9990319458
2011	18.6568247822
2012	15.3146176186
2013	11.972410455
2014	16.4022587932
2015	20.8321071313
2016	25.2619554695
2017	38.6923281704
2018	52.1227008712
2019	38.7023233301
2020	38.7023233301