Year	Number of
1990	475.34
1991	474.43
1992	478.03
1993	481.31
1994	486.16
1995	494.11
1996	498.16
1997	503.5
1998	515.82
1999	530.22
2000	550.2
2001	538.43
2002	549.09
2003	568.07
2004	569.23
2005	587.24
2006	591.7
2007	602.53
2008	615.92
2009	638.52
2010	667.33
2011	699.1
2012	731.14
2013	762.83
2014	794.2
2015	824.96
2016	856.96