Year	Number of
1990	1159.07
1991	1133.81
1992	1107.06
1993	1093.47
1994	1077.17
1995	1062.13
1996	1039.04
1997	1035.3
1998	1033.88
1999	1024.55
2000	1018.44
2001	1007.45
2002	1012.53
2003	1020.62
2004	1023.26
2005	1041.76
2006	1046.01
2007	1054.65
2008	1053.92
2009	1052.19
2010	1048.5
2011	1056.14
2012	1054.47
2013	1043.97
2014	1031.56
2015	1033.1
2016	1037.66