Year	Number of
1990	1674.08
1991	1690.69
1992	1701.19
1993	1709.88
1994	1713.21
1995	1715.61
1996	1706.56
1997	1701.58
1998	1693.05
1999	1677.92
2000	1660.32
2001	1635.46
2002	1613.77
2003	1586.85
2004	1559.04
2005	1530.71
2006	1495.64
2007	1461.01
2008	1436.17
2009	1416.57
2010	1399.34
2011	1377.73
2012	1357.13
2013	1338.4
2014	1322.47
2015	1310.65
2016	1304.12