Year	Number of
1990	427.16
1991	435.52
1992	448.25
1993	464.13
1994	481.32
1995	499.07
1996	505.88
1997	512.43
1998	519.14
1999	526.38
2000	534.65
2001	533.07
2002	532.59
2003	533.08
2004	534.09
2005	535.61
2006	548.12
2007	561.08
2008	575.06
2009	589.67
2010	605.07
2011	633.1
2012	663.26
2013	695.37
2014	729.59
2015	765.97
2016	803.8