Year	Number of
1990	1720.07
1991	1795.5
1992	1878.49
1993	1964.33
1994	2082.11
1995	2228.26
1996	2363.92
1997	2509.59
1998	2653.16
1999	2799.37
2000	2942.83
2001	3088.67
2002	3222.63
2003	3349.29
2004	3466.97
2005	3580.13
2006	3691.06
2007	3803.32
2008	3919.96
2009	4040.46
2010	4144.67
2011	4236.55
2012	4321.61
2013	4408.81
2014	4488.17
2015	4559.81
2016	4638.91