Year	Number of
1990	1649.44
1991	1605.41
1992	1605.73
1993	1599.64
1994	1604.32
1995	1584.96
1996	1514.21
1997	1428.32
1998	1338.7
1999	1292.32
2000	1252.31
2001	1213.22
2002	1189.63
2003	1179.56
2004	1191.34
2005	1201.84
2006	1191.81
2007	1147.25
2008	1069.88
2009	1018
2010	976.04
2011	951.73
2012	917.78
2013	850.64
2014	803.95
2015	777.52
2016	803.11