Year	Number of
1990	1730.59
1991	1825.14
1992	1899.5
1993	1978.06
1994	2058.13
1995	2139.7
1996	2226.76
1997	2258.63
1998	2353.92
1999	2430.46
2000	2562.93
2001	2689.8
2002	2788.86
2003	2887.29
2004	3001.18
2005	3115.2
2006	3270.65
2007	3459.14
2008	3653.64
2009	3864.16
2010	4086.74
2011	4225.27
2012	4396.63
2013	4579.32
2014	4725.57
2015	4847.39
2016	5092.55