Year	Number of
1990	780.7
1991	784.88
1992	791.79
1993	784.08
1994	779.98
1995	783.06
1996	791.09
1997	792.53
1998	790.36
1999	784.64
2000	803.54
2001	815.29
2002	828.76
2003	838.39
2004	848.61
2005	853.05
2006	849.44
2007	850.81
2008	858.46
2009	857.99
2010	873.37
2011	885.01
2012	892.93
2013	893.14
2014	882.59
2015	899.56
2016	911.25