Year	Number of
1990	855.15
1991	877.66
1992	906.92
1993	901.43
1994	935.86
1995	982.41
1996	1030.5
1997	1117.55
1998	1122.92
1999	1141.31
2000	1176.52
2001	1147.38
2002	1141.71
2003	1143.1
2004	1133.72
2005	1120.33
2006	1130.29
2007	1113.49
2008	1101.84
2009	1111.04
2010	1118.26
2011	1111.22
2012	1091.82
2013	1070
2014	1059.9
2015	1065.16
2016	1071.21