Year	Number of
1990	6855.56
1991	7061.99
1992	7324.19
1993	7516.56
1994	7747.37
1995	7933.08
1996	8054.7
1997	8207.31
1998	8395.62
1999	8043.64
2000	7855.52
2001	7800.33
2002	7896.32
2003	8013.39
2004	8190.61
2005	8449.06
2006	8737.12
2007	8745.73
2008	8817.8
2009	8941.75
2010	9134.74
2011	9393.36
2012	9362.53
2013	9305.7
2014	9231.74
2015	9553.81
2016	9854.49