Year	Number of
1990	2075.57
1991	2198.07
1992	2325.68
1993	2460.48
1994	2609.13
1995	2775.12
1996	2972.08
1997	3184.84
1998	3412.34
1999	3663.18
2000	3939.36
2001	4100.61
2002	4267.99
2003	4439.63
2004	4628.68
2005	4835.09
2006	4958.13
2007	5077.29
2008	5190.16
2009	5304.1
2010	5418.68
2011	5574.97
2012	5733.64
2013	5887.22
2014	6043.71
2015	6196.77
2016	6363.22