Year	Number of
1990	3356.78
1991	3285.84
1992	3191.99
1993	3146.09
1994	3086.91
1995	3039.07
1996	2975.39
1997	2931.7
1998	2894.21
1999	2885.25
2000	2837.1
2001	2802.25
2002	2783.62
2003	2790.35
2004	2749.14
2005	2744.52
2006	2723.19
2007	2727.67
2008	2712.66
2009	2690.94
2010	2683.71
2011	2699.96
2012	2731.41
2013	2712.46
2014	2713.78
2015	2755.99
2016	2803.14