Year	Number of
1990	517.82
1991	519.01
1992	537.44
1993	563.05
1994	594.38
1995	636.29
1996	672.98
1997	722.74
1998	780.99
1999	846.93
2000	922.34
2001	1003.91
2002	1103.12
2003	1185.06
2004	1276.28
2005	1286.92
2006	1302.16
2007	1317.74
2008	1326.11
2009	1336.6
2010	1352.11
2011	1369.64
2012	1391.88
2013	1417.93
2014	1446.4
2015	1481.27
2016	1532.54