Year	Number of
1990	1718.14
1991	1706.23
1992	1683.45
1993	1655.14
1994	1604.43
1995	1545.73
1996	1507.82
1997	1465.56
1998	1427.74
1999	1384.97
2000	1357.97
2001	1341.06
2002	1309.54
2003	1285.72
2004	1267.03
2005	1248.52
2006	1250.86
2007	1234.8
2008	1208.37
2009	1189.96
2010	1145.74
2011	1119.83
2012	1104.69
2013	1075.49
2014	1065.48
2015	1068.67
2016	1076.51