Year	Number
1996	1.96
1997	3.28
1998	3.95
1999	2.23
2000	0.62
2001	2
2002	1.91
2003	4.76
2004	4.92
2005	5.83
2006	4.83
2007	2.23
2008	3.64
2009	8.51
2010	10.82
2011	2.26
2012	8.28
2013	7.81
2014	5.16
2015	7.64
2016	5.72
2017	11.38
2018	9.74
2019	10.89
2020	14