Year	Number of
1990	1525.36
1991	1523.79
1992	1509.1
1993	1523.13
1994	1542.35
1995	1518.19
1996	1496.81
1997	1476.68
1998	1469.76
1999	1484.47
2000	1482.15
2001	1487.34
2002	1479.36
2003	1490.1
2004	1503.13
2005	1523.3
2006	1536.98
2007	1548.8
2008	1562.84
2009	1580.19
2010	1609.64
2011	1635.64
2012	1655.24
2013	1673.9
2014	1694.76
2015	1719.68
2016	1748.35