Year	Number of
1990	1364.86
1991	1384.33
1992	1405.37
1993	1425.16
1994	1404.13
1995	1403.11
1996	1428.8
1997	1446.31
1998	1474.54
1999	1471.87
2000	1496.43
2001	1511.02
2002	1549.26
2003	1574.47
2004	1599.99
2005	1622.34
2006	1657.5
2007	1695.5
2008	1717.67
2009	1766.15
2010	1803.86
2011	1853.88
2012	1896.91
2013	1958.21
2014	2011.58
2015	2081.16
2016	2161.95