Year	Number of
1990	7117.62
1991	7668.67
1992	8290.06
1993	8982.61
1994	9749.72
1995	10611.94
1996	11205.31
1997	11853.74
1998	12552.85
1999	13309.91
2000	14142.04
2001	14656.77
2002	15225.91
2003	15842.38
2004	16495.83
2005	17192.87
2006	17611.92
2007	18023.9
2008	18464.24
2009	18937.2
2010	19463.25
2011	20371.25
2012	21383.23
2013	22471.4
2014	23626.69
2015	24843.93
2016	26103.01