Year	Number of
1990	3175.6
1991	3268.92
1992	3360.93
1993	3452.8
1994	3543.21
1995	3621.8
1996	3712.66
1997	3803.93
1998	3904.93
1999	4002.83
2000	4101.39
2001	4172.14
2002	4237.76
2003	4294.8
2004	4334.6
2005	4365.26
2006	4372.38
2007	4382.3
2008	4407.01
2009	4441.45
2010	4474.07
2011	4499.74
2012	4526.16
2013	4556.12
2014	4598.29
2015	4654.57
2016	4691.67