Year	Number of
1990	3557.69
1991	3779.31
1992	4057.49
1993	4308.45
1994	4616.23
1995	4938.19
1996	5165.67
1997	5377.66
1998	5650.77
1999	5931.53
2000	6190.57
2001	6414.52
2002	6622.47
2003	6802.62
2004	6983.74
2005	7119.44
2006	7161.27
2007	7260.77
2008	7335.47
2009	7443.81
2010	7565.71
2011	7696.28
2012	7817.86
2013	8060.64
2014	8291.42
2015	8538.37
2016	8800.46