Year	Number
1996	2210.65
1997	2619.11
1998	2840.16
1999	3129.07
2000	3328.54
2001	3822.28
2002	4058.67
2003	4641.14
2004	5231.43
2005	5912.99
2006	7157.81
2007	7580.42
2008	8628.54
2009	9439.35
2010	10470.81
2011	11783.01
2012	12791.52
2013	13616.2
2014	14118.17
2015	14418.37
2016	14061.16
2017	14028.18
2018	14475.86
2019	15928.35
2020	17098.9