Year	Number
1996	5949.63
1997	6304.13
1998	6222.3
1999	6264.67
2000	6614.6
2001	7073.06
2002	7505.6
2003	7854.83
2004	8060.2
2005	8921.33
2006	9110.6
2007	9799.94
2008	10300.65
2009	10837.18
2010	11058.41
2011	11683.33
2012	12050.36
2013	12201.98
2014	12408.16
2015	12840.55
2016	12668.55
2017	12756.54
2018	12713.75
2019	13162.53
2020	13700.08