Year	Number of
1990	2249.8
1991	2274.08
1992	2335.75
1993	2413.5
1994	2463.32
1995	2551.9
1996	2602.15
1997	2651.73
1998	2722.76
1999	2799.84
2000	2806.17
2001	2880.9
2002	2990.03
2003	3110.58
2004	3182.56
2005	3330.13
2006	3392.8
2007	3465.8
2008	3636.57
2009	3826.49
2010	3884.7
2011	3984.68
2012	4169.16
2013	4432.47
2014	4657.98
2015	4767.47
2016	4947.86