Year	Number of
1990	4819.88
1991	5076.13
1992	5353.38
1993	5653.72
1994	5976.99
1995	6325.74
1996	6612.48
1997	6915.42
1998	7243.81
1999	7588.62
2000	7952.42
2001	8175.32
2002	8401.98
2003	8650.17
2004	8912.23
2005	9193.53
2006	9406.58
2007	9629.69
2008	9871.07
2009	10135.79
2010	10433.24
2011	10765.13
2012	11123.11
2013	11481.78
2014	11872.18
2015	12297.2
2016	12768.42