Year	Number of
1990	7831.81
1991	8164.21
1992	8529.46
1993	8931.15
1994	9363.51
1995	9827.73
1996	10116.62
1997	10421.61
1998	10748.64
1999	11089.44
2000	11444.91
2001	11682.57
2002	11925.6
2003	12186.06
2004	12459.02
2005	12747.69
2006	12978.34
2007	13225.68
2008	13490.15
2009	13771.68
2010	14072.16
2011	14428.95
2012	14804.22
2013	15183.13
2014	15584.93
2015	16010.71
2016	16427.16