Year	Number
1996	1.67
1997	1
1998	0.05
1999	0
2000	0.37
2001	0.83
2002	0.78
2003	1.77
2004	0.58
2005	0.25
2006	0.97
2007	1.31
2008	0
2009	1.78
2010	2.23
2011	0
2012	0.52
2013	0.16
2014	1.24
2015	1.42
2016	1.12
2017	0.88
2018	0.86
2019	2.37
2020	2.09