Year	Number of
1990	3596.79
1991	3664.31
1992	3744.5
1993	3835.63
1994	3940.51
1995	4058.55
1996	4126.7
1997	4208.01
1998	4295.16
1999	4382.09
2000	4469.82
2001	4513.97
2002	4563.4
2003	4610.71
2004	4664.28
2005	4726.85
2006	4749.98
2007	4784.45
2008	4820.86
2009	4852.58
2010	4880.94
2011	4877.11
2012	4876.18
2013	4871.52
2014	4867.24
2015	4867.38
2016	4867.15