Year	Number of
1990	1402.44
1991	1448.74
1992	1498.72
1993	1552.17
1994	1603.35
1995	1667.01
1996	1694.86
1997	1734.79
1998	1776.15
1999	1830.87
2000	1896.45
2001	1971.31
2002	2049.28
2003	2129.02
2004	2215.49
2005	2316.99
2006	2371.72
2007	2428.72
2008	2487.68
2009	2571.24
2010	2662.62
2011	2782.02
2012	2912.71
2013	3040.76
2014	3163.49
2015	3291.65
2016	3424.94