Year	Number of
1990	7006.55
1991	6958.62
1992	6935.83
1993	6977.71
1994	6971.98
1995	6993.03
1996	6943.36
1997	6885.13
1998	6919.66
1999	7018.39
2000	7017.96
2001	6996.28
2002	6998.45
2003	6956.51
2004	6862.64
2005	6794.29
2006	6724.67
2007	6672.58
2008	6652.18
2009	6601.99
2010	6624.35
2011	6655.5
2012	6709.54
2013	6793.87
2014	6892.12
2015	7038.79
2016	7177.28