Year	Number of
1990	242.93
1991	249.54
1992	254.6
1993	255.51
1994	258.15
1995	263.98
1996	278.65
1997	296.79
1998	320.22
1999	346.01
2000	373.79
2001	401.65
2002	432.82
2003	473.03
2004	513.87
2005	554.99
2006	583.39
2007	609.16
2008	637.49
2009	667.62
2010	701.33
2011	726.16
2012	754.68
2013	783.9
2014	814.02
2015	844.6
2016	879.45