Year	Number of
1990	985.73
1991	1027.49
1992	1074.17
1993	1123.63
1994	1183.27
1995	1215.69
1996	1232.73
1997	1252.95
1998	1276.05
1999	1290.86
2000	1296.38
2001	1308.46
2002	1321.05
2003	1314.36
2004	1316.9
2005	1320.24
2006	1344.16
2007	1367.68
2008	1392.07
2009	1424.35
2010	1455.92
2011	1487.19
2012	1522.88
2013	1558.98
2014	1591.94
2015	1628.9
2016	1660.52