Year	Number
1996	2
1997	0.87
1998	2.08
1999	0
2000	0
2001	2.64
2002	0.5
2003	4.7
2004	1.31
2005	4.93
2006	5.02
2007	6.23
2008	1.68
2009	2.55
2010	1.2
2011	0.88
2012	4.53
2013	5.26
2014	4.18
2015	7.96
2016	7.91
2017	1.67
2018	3.29
2019	7.44
2020	9.7