Year	Number of
1990	996.87
1991	1012.27
1992	1033.26
1993	1062.08
1994	1105.8
1995	1143.43
1996	1147.82
1997	1156.54
1998	1169.71
1999	1182.88
2000	1183.92
2001	1165.79
2002	1141.4
2003	1125.43
2004	1116.07
2005	1112.99
2006	1092.67
2007	1075.26
2008	1050.95
2009	1044.74
2010	1050.54
2011	1048.76
2012	1047.16
2013	1044.24
2014	1045.94
2015	1052.42
2016	1059.51