Year	Number of
1990	4924.68
1991	5030.17
1992	5127.21
1993	5227.84
1994	5326
1995	5413.51
1996	5510.09
1997	5637.52
1998	5779.93
1999	5922.16
2000	6078.94
2001	6260.06
2002	6471.35
2003	6647.61
2004	6840.16
2005	7034.23
2006	7183.08
2007	7351.17
2008	7560.26
2009	7790.18
2010	8032.3
2011	8277.95
2012	8547.65
2013	8850.31
2014	9155.26
2015	9493.32
2016	9848.84