Year	Number of
1990	3151.8
1991	3215.61
1992	3314.4
1993	3447.11
1994	3589.5
1995	3721.89
1996	3815.36
1997	3849.74
1998	3861.72
1999	3929.26
2000	4017.12
2001	4084.13
2002	4167.63
2003	4235.34
2004	4294.03
2005	4339.41
2006	4365.8
2007	4373.19
2008	4408.9
2009	4468.65
2010	4546.3
2011	4503.34
2012	4478.59
2013	4412.37
2014	4392.7
2015	4293.09
2016	4181.77