Year	Number of
1990	4696.95
1991	4872.3
1992	5052.93
1993	5250.07
1994	5446.31
1995	5691.93
1996	5859.8
1997	6030.6
1998	6195.47
1999	6355.55
2000	6516.32
2001	6735.84
2002	6942.56
2003	7154.86
2004	7366.92
2005	7587.1
2006	7692.43
2007	7784.88
2008	7869.88
2009	7970.43
2010	8068.46
2011	8224.75
2012	8385.71
2013	8540.04
2014	8674.58
2015	8817.66
2016	8996.17