Year	Number of
1990	4313.94
1991	4459.33
1992	4616.16
1993	4783.13
1994	4962.56
1995	5160
1996	5393.52
1997	5655.96
1998	5943.47
1999	6249.03
2000	6574.61
2001	6841.13
2002	7110.45
2003	7389.37
2004	7692.71
2005	8034.76
2006	8330.48
2007	8652.07
2008	9013.11
2009	9399.42
2010	9818.65
2011	10177.71
2012	10570.93
2013	10986.46
2014	11427.87
2015	11895.62
2016	12377.86