Year	Number of
1990	1257.45
1991	1311.96
1992	1273.81
1993	1253.96
1994	1238.5
1995	1270.04
1996	1244
1997	1211.25
1998	1203.1
1999	1193.04
2000	1176.35
2001	1183.45
2002	1164.83
2003	1167.56
2004	1143.61
2005	1139.09
2006	1132.99
2007	1132.9
2008	1123.51
2009	1122.49
2010	1128.69
2011	1129.43
2012	1125.27
2013	1119.75
2014	1123.26
2015	1131.74
2016	1142.51