Year	Number of
1990	374.39
1991	383.47
1992	397.69
1993	409.42
1994	427.69
1995	433.38
1996	442.8
1997	451.05
1998	463.01
1999	477.98
2000	485.7
2001	500.33
2002	521.12
2003	549.49
2004	581.3
2005	617.83
2006	645.85
2007	669.48
2008	700.56
2009	734.31
2010	775.54
2011	816.12
2012	862.64
2013	913.42
2014	956.07
2015	1005.51
2016	1058.34