Year	Number of
1990	471.11
1991	477.98
1992	477.23
1993	477.51
1994	481.92
1995	497.11
1996	509.66
1997	533.28
1998	558.99
1999	582.64
2000	610.25
2001	624.54
2002	643.54
2003	659.19
2004	671.35
2005	680.92
2006	690.9
2007	698.72
2008	715.86
2009	730.86
2010	735.67
2011	741.07
2012	749.53
2013	763.18
2014	780.94
2015	800.98
2016	817.73