Year	Number of
1990	6351.97
1991	6372.44
1992	6375.46
1993	6442.61
1994	6383.52
1995	6315.8
1996	6120.06
1997	5921.81
1998	5921.28
1999	5824.15
2000	5816.1
2001	5915.83
2002	5949.11
2003	5803.66
2004	5788.18
2005	5773.98
2006	5733.86
2007	5788.39
2008	5874.22
2009	5926.23
2010	5966.76
2011	6045.43
2012	6165.16
2013	6196.78
2014	6164.74
2015	6287.53
2016	6403.87