Year	Number of
1990	6475.67
1991	6715.57
1992	6956.39
1993	7201.74
1994	7463.04
1995	7755.46
1996	8041.91
1997	8341.34
1998	8665.82
1999	9014.58
2000	9385.41
2001	9572.45
2002	9788.79
2003	10043.76
2004	10347.46
2005	10688.26
2006	10777.43
2007	10880.07
2008	11000.6
2009	11130.35
2010	11265.99
2011	11507.68
2012	11745.88
2013	11993.76
2014	12254.88
2015	12521.75
2016	12792.04