Year	Number of
1990	382.88
1991	396.79
1992	420.67
1993	441.04
1994	466.87
1995	482.93
1996	487.08
1997	512.44
1998	525.62
1999	523.67
2000	530.54
2001	560.1
2002	567.86
2003	581.34
2004	578.46
2005	568.04
2006	557.53
2007	561.88
2008	572.04
2009	581.51
2010	593.8
2011	607.3
2012	618.16
2013	633.72
2014	652.32
2015	673.28
2016	698.41