Year	Number
1996	3.03
1997	0.46
1998	2.84
1999	0.08
2000	1.5
2001	1.09
2002	0
2003	0.17
2004	1.58
2005	1.33
2006	0.67
2007	2.42
2008	3.76
2009	1.21
2010	1.3
2011	2.33
2012	3.66
2013	6.53
2014	4.9
2015	7.25
2016	6.96
2017	14.31
2018	11.95
2019	12.12
2020	11.28