Year	Number of
1990	5098.98
1991	4803.95
1992	4811.22
1993	4648.73
1994	4503.48
1995	4470.07
1996	4185.14
1997	3986.9
1998	3775.84
1999	3549.84
2000	3477.52
2001	3375.6
2002	3299.98
2003	3198.86
2004	3104.32
2005	3066.81
2006	2981.28
2007	2918.25
2008	2911.42
2009	2884.64
2010	2911
2011	2852.77
2012	2855.28
2013	2841.74
2014	2807.17
2015	2806.22
2016	2836.21