Year	Number
1996	2.19
1997	1.8
1998	1.75
1999	1.2
2000	1.04
2001	2.79
2002	1.92
2003	5.4
2004	4.18
2005	4.69
2006	12.48
2007	21.24
2008	23.41
2009	17.53
2010	17.49
2011	23.02
2012	29.85
2013	34.5
2014	55.26
2015	33.62
2016	34.97
2017	55.14
2018	45.86
2019	57.54
2020	56.11