Year	Number of
1990	5028.74
1991	5419.14
1992	5859.41
1993	6348.25
1994	6923.79
1995	7616.88
1996	8152.29
1997	8705.02
1998	9288.22
1999	9881.29
2000	10450.87
2001	10910.52
2002	11366.6
2003	11795.33
2004	12280.71
2005	12806.21
2006	13171.81
2007	13585.1
2008	14091.72
2009	14656.96
2010	15271.54
2011	15904.71
2012	16612.23
2013	17378.61
2014	18316.49
2015	19339.12
2016	20535.65