Year	Number of
1990	1129.58
1991	1158.72
1992	1195.41
1993	1241.01
1994	1298.5
1995	1357.3
1996	1404.77
1997	1434.1
1998	1463.32
1999	1514.68
2000	1556.74
2001	1587.38
2002	1627.06
2003	1661.58
2004	1700.85
2005	1733.29
2006	1752.83
2007	1777.89
2008	1812.15
2009	1863.56
2010	1915.22
2011	1936.19
2012	1956.72
2013	1952.8
2014	1965.16
2015	1943.97
2016	1922.72