Year	Number of
1990	2705.6
1991	2799.53
1992	2894.33
1993	2990.58
1994	3094.47
1995	3211.71
1996	3335.44
1997	3476.93
1998	3639.85
1999	3814.87
2000	4001.37
2001	4142.11
2002	4291.85
2003	4457.34
2004	4624.02
2005	4794.35
2006	4908.83
2007	5016.17
2008	5141.87
2009	5275.62
2010	5423.93
2011	5572
2012	5734.29
2013	5910.15
2014	6091.23
2015	6275.31
2016	6463.11