Year	Number of
1990	3639.55
1991	3735.47
1992	3841.56
1993	3961.85
1994	4088.3
1995	4217.13
1996	4365.07
1997	4517.54
1998	4685.45
1999	4860.08
2000	5036.68
2001	5226.35
2002	5410.12
2003	5614.49
2004	5836.7
2005	6076.3
2006	6301.73
2007	6547.2
2008	6799.9
2009	7048.15
2010	7272.56
2011	7451.35
2012	7624.12
2013	7813.47
2014	8007.76
2015	8245.69
2016	8455.31