Year	Number of
1990	8930.05
1991	9595.36
1992	10325.1
1993	11079.48
1994	11896.18
1995	12807.95
1996	13241.25
1997	13703.31
1998	14210.65
1999	14751.17
2000	15344.39
2001	16109.65
2002	16886.88
2003	17695.93
2004	18554.59
2005	19495.79
2006	20106.19
2007	20773.05
2008	21473.23
2009	22196.18
2010	22995.22
2011	23900.69
2012	24793.41
2013	25699.11
2014	26618.16
2015	27550.99
2016	28518.57