Year	Number of
1990	4214.91
1991	4308.58
1992	4309.46
1993	4318.83
1994	4287.06
1995	4327.99
1996	4003.59
1997	3720.8
1998	3451.68
1999	3369.36
2000	3255.23
2001	3122.29
2002	3032.95
2003	2955.38
2004	2899.27
2005	2831.89
2006	2701.66
2007	2705.15
2008	2688.28
2009	2531.8
2010	2445.89
2011	2403.49
2012	2468.02
2013	2478.86
2014	2403.58
2015	2452.49
2016	2515.9