Year	Number of
1990	486.41
1991	519.3
1992	553.69
1993	590.1
1994	628.88
1995	670.68
1996	704.71
1997	741.75
1998	781.38
1999	822.87
2000	867.99
2001	909.83
2002	955.1
2003	1003.21
2004	1053.76
2005	1107.97
2006	1179.26
2007	1254.82
2008	1336.15
2009	1423.42
2010	1517.84
2011	1581.2
2012	1645.61
2013	1711.6
2014	1779.2
2015	1848.46
2016	1920.5