Year	Number of
1990	671.55
1991	714.84
1992	763.51
1993	817.53
1994	876.46
1995	940.54
1996	996.12
1997	1054.43
1998	1116.18
1999	1181.24
2000	1250.21
2001	1303.79
2002	1359.82
2003	1418.96
2004	1481.42
2005	1547.75
2006	1607.27
2007	1670.2
2008	1737.01
2009	1805.71
2010	1876.16
2011	1968.41
2012	2065.43
2013	2167.68
2014	2275.9
2015	2390.85
2016	2504.25