Year	Number
1996	2440.02
1997	3168.89
1998	3211.31
1999	4040.11
2000	4812.54
2001	4917.06
2002	5494.59
2003	6134.13
2004	7460.22
2005	8026.66
2006	8337.4
2007	8128.59
2008	8657.21
2009	8950.62
2010	9878.21
2011	10144.48
2012	10726.75
2013	10946.21
2014	11163.71
2015	11366.41
2016	11796.3
2017	11951.76
2018	11768.55
2019	11678.08
2020	12221.19