Year	Number
1996	0.53
1997	0.5
1998	0.2
1999	1.48
2000	0.25
2001	0.67
2002	0.17
2003	1.39
2004	1.63
2005	0.37
2006	4.14
2007	3.67
2008	2.47
2009	5.04
2010	3.05
2011	2.7
2012	3.88
2013	7.6
2014	8.77
2015	10.85
2016	8.34
2017	14.24
2018	8.94
2019	13.25
2020	21.5