Year	Number of
1990	9231
1991	9531.33
1992	9905.71
1993	10235.31
1994	10616.17
1995	10982.31
1996	11326.52
1997	11679.49
1998	12055.45
1999	12484.28
2000	12831.89
2001	13076.93
2002	13357
2003	13778.57
2004	14169.18
2005	14467.43
2006	14639.98
2007	14848.85
2008	15038.16
2009	15215.36
2010	15437.11
2011	15691.6
2012	15934.5
2013	16343.5
2014	16711.13
2015	17199.11
2016	17656.28