Year	Number of
1990	415.95
1991	452.24
1992	443.09
1993	440.11
1994	440.94
1995	451.92
1996	465.87
1997	472.85
1998	477.86
1999	490.73
2000	492.44
2001	497.56
2002	501.5
2003	515.81
2004	514.35
2005	516.11
2006	522.27
2007	531
2008	529.73
2009	530.35
2010	548.76
2011	552.98
2012	560.76
2013	558.73
2014	557.51
2015	565.48
2016	574.15