Year	Number of
1990	273.99
1991	302.98
1992	335.38
1993	373.21
1994	411.77
1995	450.97
1996	468.56
1997	486.61
1998	499.06
1999	512.01
2000	526.7
2001	542.04
2002	559.16
2003	578.94
2004	601.08
2005	628.54
2006	645.42
2007	665.05
2008	688.81
2009	717.07
2010	750.94
2011	775.72
2012	808.11
2013	840.71
2014	877.92
2015	922.45
2016	970.62