Year	Number of
1990	407.07
1991	431.15
1992	453.87
1993	457.99
1994	493.57
1995	511.36
1996	537.88
1997	552.44
1998	566.2
1999	582.32
2000	597.64
2001	618.54
2002	677.3
2003	698.1
2004	697.16
2005	718.3
2006	751.64
2007	780.91
2008	824.26
2009	855.66
2010	880.16
2011	916.38
2012	947.29
2013	987.97
2014	1013.55
2015	1046.08
2016	1080.09