Year	Number of
1990	6030.18
1991	6325.68
1992	6667.11
1993	7085.62
1994	7557.34
1995	8020.17
1996	8638.4
1997	9208.27
1998	9884.94
1999	10491.98
2000	11015.69
2001	11480.37
2002	11953.41
2003	12556.52
2004	13111.86
2005	13575.06
2006	14072.18
2007	14469.31
2008	14864.64
2009	15242.75
2010	15667.63
2011	16037.58
2012	16386.22
2013	16864.9
2014	17374.41
2015	18073.83
2016	19103.98