Year	Number of
1990	3276.41
1991	3335.06
1992	3392.24
1993	3446.49
1994	3507.32
1995	3582.19
1996	3624.89
1997	3668.9
1998	3715.44
1999	3760.36
2000	3801.28
2001	3854.59
2002	3907.38
2003	3960.43
2004	4021.37
2005	4091.66
2006	4153.98
2007	4222.12
2008	4290.06
2009	4360.34
2010	4433.89
2011	4498.72
2012	4556.82
2013	4612.1
2014	4679.22
2015	4746.1
2016	4816.12