Year	Number
1996	37.61
1997	32.73
1998	33.33
1999	34.27
2000	27.9
2001	35.31
2002	25.78
2003	31.24
2004	36.92
2005	36.85
2006	44
2007	36.46
2008	43.22
2009	38.47
2010	45.39
2011	33.81
2012	36.58
2013	45.69
2014	46.24
2015	41.96
2016	47.93
2017	46.42
2018	35.52
2019	49.94
2020	58.19