Year	Number of
1990	3416.52
1991	3380.67
1992	3392.77
1993	3386.66
1994	3340.56
1995	3337.19
1996	3354.6
1997	3347.48
1998	3349.4
1999	3248.35
2000	3187.88
2001	3103.6
2002	3042.41
2003	3013.05
2004	2918.89
2005	2878.11
2006	2849.67
2007	2842.75
2008	2807.57
2009	2814.21
2010	2862.49
2011	2893.22
2012	2897.81
2013	2854.42
2014	2858
2015	2861.52
2016	2867.54