Year	Number of
1990	3771.22
1991	3877.98
1992	3949.77
1993	4045.21
1994	4110.42
1995	4188.62
1996	4009.29
1997	3768.53
1998	3489.13
1999	3498.2
2000	3451.17
2001	3321.96
2002	3282.39
2003	3232.92
2004	3232.52
2005	3326.51
2006	3154.4
2007	3202.8
2008	3164.63
2009	2863.82
2010	2703.01
2011	2568.9
2012	2612.83
2013	2640.37
2014	2542.32
2015	2542.46
2016	2598.16