Year	Number of
1990	3159.02
1991	3281.56
1992	3404.69
1993	3501.41
1994	3612.99
1995	3737.51
1996	3720.09
1997	3710.22
1998	3697.76
1999	3677.44
2000	3657.73
2001	3710.17
2002	3764.62
2003	3824.23
2004	3875.42
2005	3942.37
2006	4011.11
2007	4087.05
2008	4162.54
2009	4242.08
2010	4333.71
2011	4446.4
2012	4568.73
2013	4682.84
2014	4798.04
2015	4974.97
2016	5179.55