Year	Number of
1990	473.93
1991	487.3
1992	503.22
1993	520.71
1994	539.34
1995	558.9
1996	574.7
1997	591.34
1998	609.19
1999	628.3
2000	649.09
2001	669.46
2002	691.89
2003	716.49
2004	742.3
2005	769.42
2006	800.59
2007	832.8
2008	867.36
2009	903.86
2010	942.8
2011	982.08
2012	1024
2013	1068.38
2014	1115.65
2015	1165.97
2016	1217.17