Year	Number
1996	2351.45
1997	2342.28
1998	2402.36
1999	2404.74
2000	2682.75
2001	2953.45
2002	3020.31
2003	3419.01
2004	3536.4
2005	3583.01
2006	3909.76
2007	4412.85
2008	4834.3
2009	5971.34
2010	6527.11
2011	7172.97
2012	8206.6
2013	8436.29
2014	8878.42
2015	9620.87
2016	10948.46
2017	11000.53
2018	12944.42
2019	15216.46
2020	18469.18