Year	Number
1996	9.5
1997	9.75
1998	2.25
1999	8.39
2000	8.17
2001	12.25
2002	12.58
2003	6.43
2004	5.38
2005	7.03
2006	11.92
2007	9.75
2008	10.92
2009	11.45
2010	12.18
2011	12.64
2012	21.26
2013	14.94
2014	11.63
2015	16.34
2016	20.34
2017	21.01
2018	20.78
2019	34.71
2020	35.94