Year	Number of
1990	3059.43
1991	3132.16
1992	3278.46
1993	3408.58
1994	3573.64
1995	3730.18
1996	4000.83
1997	4262.89
1998	4521.24
1999	4821.26
2000	5102.67
2001	5382.88
2002	5648.82
2003	5930.85
2004	6194.28
2005	6655.54
2006	6857.61
2007	7187.81
2008	7435.26
2009	7681.46
2010	8014.8
2011	8323.65
2012	8602.66
2013	9025.94
2014	9344.03
2015	9664.12
2016	9902.79