Year	Number of
1990	1865.02
1991	1951.34
1992	2032.76
1993	2133.18
1994	2242.62
1995	2355.81
1996	2447.51
1997	2541.99
1998	2619.35
1999	2727.02
2000	2872.54
2001	2999.33
2002	3136.61
2003	3251.9
2004	3398.77
2005	3547.62
2006	3638.52
2007	3763.48
2008	3941.8
2009	4168.24
2010	4380.48
2011	4528.34
2012	4699.07
2013	4858.18
2014	5027.97
2015	5158.26
2016	5283.07