Year	Number
1996	9.82
1997	13.35
1998	3.81
1999	6.1
2000	1.65
2001	3.58
2002	0.93
2003	4.42
2004	5.02
2005	4.3
2006	5.63
2007	4.48
2008	2.54
2009	3.33
2010	12.37
2011	10.02
2012	10.65
2013	14.28
2014	12.41
2015	12.5
2016	11.72
2017	13.19
2018	20.58
2019	24.12
2020	33.27