Year	Number of
1990	4205.12
1991	4217.67
1992	4321.81
1993	4420.65
1994	4509.34
1995	4637.1
1996	4813.85
1997	4801.5
1998	4757.4
1999	4612.26
2000	4582.19
2001	4626.43
2002	4664.11
2003	4613.66
2004	4459.45
2005	4449.5
2006	4365.53
2007	4273.69
2008	4259.67
2009	4218.03
2010	4049.07
2011	3794.74
2012	3776.18
2013	3779.63
2014	3764.31
2015	3637.62
2016	3555.35