Year	Number of
1990	3385.75
1991	3489.31
1992	3614.78
1993	3803.16
1994	3948.63
1995	4122.95
1996	4303.61
1997	4469.07
1998	4629.96
1999	4700.29
2000	4763.2
2001	4785.19
2002	4806.15
2003	4862.73
2004	4912.28
2005	4984.78
2006	5082.75
2007	5152.96
2008	5099.76
2009	5069.96
2010	5065.8
2011	5157
2012	5174.05
2013	5214.01
2014	5265.24
2015	5408.39
2016	5548.5