Year	Number of
1990	1443.08
1991	1464.94
1992	1517.76
1993	1555.93
1994	1591.01
1995	1620.71
1996	1651.83
1997	1683.4
1998	1646.22
1999	1624.9
2000	1620.2
2001	1533.93
2002	1522.58
2003	1493.6
2004	1491.99
2005	1522.74
2006	1518.57
2007	1570.04
2008	1584.75
2009	1630.41
2010	1686.19
2011	1716.49
2012	1744.47
2013	1796.43
2014	1912.38
2015	2051.37
2016	2134.59