Year	Number of
1990	4918.8
1991	4853.02
1992	4797.14
1993	4791.85
1994	4747.39
1995	4677.72
1996	4642.76
1997	4598.34
1998	4558.67
1999	4540.94
2000	4456.02
2001	4416.24
2002	4380.21
2003	4373.76
2004	4347.42
2005	4343.23
2006	4297.75
2007	4292.41
2008	4260.22
2009	4240.11
2010	4199.05
2011	4164.64
2012	4183.39
2013	4142.18
2014	4106.5
2015	4168.52
2016	4222.62