Year	Number
1996	1.65
1997	0.64
1998	3.81
1999	0
2000	0
2001	4.26
2002	2
2003	4.58
2004	2.16
2005	5.27
2006	4.19
2007	3.94
2008	5.22
2009	4.22
2010	8.78
2011	6.94
2012	11.84
2013	12.08
2014	9.21
2015	10.28
2016	10.55
2017	11.34
2018	11.67
2019	6.15
2020	6.42