Year	Number of
1990	5764.01
1991	5596.34
1992	5465.12
1993	5407.49
1994	5339.97
1995	5319.24
1996	5249.42
1997	5077.89
1998	5068.4
1999	5001.05
2000	4913.65
2001	4859.23
2002	4814.36
2003	4787.85
2004	4686.34
2005	4646.66
2006	4613.52
2007	4564.07
2008	4546.09
2009	4536.86
2010	4497.3
2011	4487.29
2012	4505.36
2013	4498.85
2014	4464.02
2015	4520.79
2016	4579.35