Year	Number of
1990	1887.78
1991	1939.59
1992	1993.33
1993	2049.96
1994	2111.52
1995	2181.31
1996	2247.53
1997	2321.62
1998	2401.72
1999	2486.04
2000	2575.67
2001	2647.7
2002	2723.26
2003	2801.57
2004	2882.89
2005	2969.73
2006	3055.88
2007	3146.88
2008	3244.89
2009	3348.75
2010	3460.09
2011	3581.29
2012	3710.28
2013	3844.89
2014	3987.08
2015	4136.33
2016	4283.34