Year	Number of
1990	1540.66
1991	1511.31
1992	1474.02
1993	1454.52
1994	1412.13
1995	1414.3
1996	1400.62
1997	1365.83
1998	1346.99
1999	1340.85
2000	1308.14
2001	1283.32
2002	1256.84
2003	1247.4
2004	1215.39
2005	1210.32
2006	1178.45
2007	1168.69
2008	1155.11
2009	1146.86
2010	1131.13
2011	1123.11
2012	1126.94
2013	1112.1
2014	1102.97
2015	1105.22
2016	1107.29