Year	Number of
1990	1064.8
1991	1121.16
1992	1164.66
1993	1201.96
1994	1241.56
1995	1283.53
1996	1298.09
1997	1315.75
1998	1334.37
1999	1352.3
2000	1373
2001	1388.35
2002	1404.85
2003	1423.52
2004	1443.69
2005	1467.96
2006	1491.64
2007	1513.13
2008	1533.31
2009	1554.06
2010	1578.25
2011	1638.47
2012	1700.74
2013	1766.38
2014	1830.77
2015	1895.95
2016	1962.16