Year	Number of
1990	9652.49
1991	10004.94
1992	10383.18
1993	10784.78
1994	11212.71
1995	11672.24
1996	11851.45
1997	12045.59
1998	12251.39
1999	12459.33
2000	12670.77
2001	12978.42
2002	13230.56
2003	13481.28
2004	13739.45
2005	14001.65
2006	14391.18
2007	14796.41
2008	15221.96
2009	15671.52
2010	16154.13
2011	16448.98
2012	16753.37
2013	17060.73
2014	17383.27
2015	17755.08
2016	18144.22