Year	Number of
1990	3614.13
1991	3668.15
1992	3710.01
1993	3746.55
1994	3771.6
1995	3779.62
1996	3778.51
1997	3778.38
1998	3775.82
1999	3759.16
2000	3741.45
2001	3698.59
2002	3661.26
2003	3611.1
2004	3550.38
2005	3484.95
2006	3398.02
2007	3311.94
2008	3246.75
2009	3193.27
2010	3140.47
2011	3082.99
2012	3022.97
2013	2967.4
2014	2920.02
2015	2880.54
2016	2854.17