Year	Number of
1990	1336.98
1991	1370.45
1992	1404.06
1993	1439.35
1994	1476.88
1995	1518.09
1996	1550.94
1997	1587.02
1998	1626.49
1999	1668.81
2000	1714.27
2001	1743.04
2002	1774.09
2003	1807.27
2004	1841.35
2005	1877.56
2006	1914.52
2007	1953.58
2008	1998.27
2009	2048.02
2010	2104.01
2011	2157.28
2012	2216.09
2013	2276.48
2014	2343.16
2015	2416.38
2016	2492.64