Year	Number of
1990	1442.74
1991	1504.47
1992	1530.78
1993	1568.89
1994	1593.31
1995	1553.89
1996	1634.35
1997	1656.17
1998	1682.53
1999	1685.03
2000	1670.12
2001	1683.75
2002	1684.85
2003	1630.16
2004	1654.48
2005	1698.58
2006	1735.85
2007	1785.16
2008	1820.35
2009	1828.73
2010	1854.78
2011	1874.58
2012	1889.52
2013	1898.65
2014	1921.74
2015	1957.41
2016	1970.98