Year	Number of
1990	2497.5
1991	2581.71
1992	2672.74
1993	2776
1994	2879.52
1995	2981.57
1996	3048.01
1997	3115.98
1998	3175.94
1999	3251.37
2000	3347.13
2001	3467.77
2002	3605.89
2003	3752.16
2004	3905.38
2005	4063.43
2006	4218.72
2007	4371.2
2008	4551.54
2009	4735.79
2010	4930.49
2011	5109.31
2012	5303.31
2013	5500.34
2014	5714.42
2015	5945.58
2016	6185.57