Year	Number of
1990	3810.92
1991	3995.73
1992	4189.96
1993	4354.29
1994	4528.97
1995	4723.75
1996	4957.37
1997	5268.1
1998	5428.44
1999	5535.05
2000	5595.21
2001	5515.18
2002	5466.08
2003	5477.33
2004	5490.1
2005	5482.28
2006	5671.84
2007	5800.86
2008	5933.45
2009	6068.14
2010	6217.25
2011	6319.88
2012	6448.79
2013	6603.64
2014	6760.44
2015	6950.45
2016	7138.98