Year	Number of
1990	5051.7
1991	4933.82
1992	4792.26
1993	4579.48
1994	4403.18
1995	4293.12
1996	4174.81
1997	4029.73
1998	3894.55
1999	3804.74
2000	3740.96
2001	3733.24
2002	3658.11
2003	3598.51
2004	3531.17
2005	3478.44
2006	3419.29
2007	3383.1
2008	3352.56
2009	3315.05
2010	3313.99
2011	3312.16
2012	3279.25
2013	3271.86
2014	3246.3
2015	3200.47
2016	3205.61