Year	Number of
1990	1412.56
1991	1501.51
1992	1635.38
1993	1779.24
1994	1889.44
1995	2074.68
1996	2204.94
1997	2325.61
1998	2521.15
1999	2693.79
2000	2940.5
2001	3136.95
2002	3355.96
2003	3656.67
2004	3925.02
2005	4155.16
2006	4395.97
2007	4618.9
2008	4842.68
2009	5065.36
2010	5352.53
2011	5593.72
2012	5773.46
2013	5857.42
2014	5917.8
2015	5958.97
2016	5993.54