Year	Number
1996	0.9
1997	1.29
1998	0.13
1999	1.25
2000	0.98
2001	0.2
2002	0.2
2003	0.33
2004	1.17
2005	2.4
2006	1.17
2007	3.59
2008	0.74
2009	0.76
2010	2.15
2011	3.95
2012	1.2
2013	8.93
2014	1.51
2015	1.74
2016	4.84
2017	3.73
2018	3.07
2019	3.79
2020	3.4