Year	Number of
1990	1816.45
1991	1791.6
1992	1800.04
1993	1796.13
1994	1760.49
1995	1743.85
1996	1749.53
1997	1736.16
1998	1733.09
1999	1692.87
2000	1653
2001	1618.45
2002	1579.96
2003	1573.66
2004	1526.47
2005	1516.17
2006	1505.1
2007	1511.81
2008	1494.11
2009	1497.95
2010	1520.24
2011	1536.25
2012	1545.2
2013	1525.76
2014	1531.8
2015	1537.61
2016	1543.53