Year	Number of
1990	3227.36
1991	3436.55
1992	3666.69
1993	3958.28
1994	4054.81
1995	4162.29
1996	4119.95
1997	4097.32
1998	4041.23
1999	3987.07
2000	3844.83
2001	3847.82
2002	3814.12
2003	3682.12
2004	3624.66
2005	3571.8
2006	3428.74
2007	3257.25
2008	3223.68
2009	3202.72
2010	3217.96
2011	3186.75
2012	2955.74
2013	2842.03
2014	2766.67
2015	2792.72
2016	2837.41