Year	Number of
1990	2519.47
1991	2525.78
1992	2655.97
1993	2560.82
1994	2676.13
1995	2599.15
1996	2803.48
1997	3191.27
1998	3336.83
1999	3534.41
2000	3831.06
2001	3821.28
2002	3917.02
2003	4043.13
2004	4136.68
2005	4252.74
2006	4341.64
2007	4271.26
2008	4179.98
2009	4175.45
2010	4219.82
2011	4206.55
2012	4122.8
2013	4156.79
2014	4301.55
2015	4364.3
2016	4395.6