Year	Number of
1990	1303.33
1991	1405.86
1992	1512.22
1993	1627.52
1994	1753.81
1995	1895.25
1996	2074.06
1997	2279.71
1998	2518.27
1999	2780.3
2000	3066.07
2001	3371.9
2002	3703.86
2003	4086.99
2004	4511.18
2005	4980.23
2006	5366.98
2007	5789.34
2008	6279.8
2009	6823.04
2010	7417.4
2011	7901.15
2012	8416.7
2013	8998.66
2014	9608.46
2015	10248.79
2016	10942.59