Year	Number of
1990	1023.9
1991	1048.49
1992	1070.21
1993	1077.42
1994	1079.75
1995	1086.38
1996	1069.83
1997	1051.26
1998	1030.03
1999	1029.81
2000	1035
2001	1033.93
2002	1042.23
2003	1050.17
2004	1071.81
2005	1106.33
2006	1107.15
2007	1120.44
2008	1127.98
2009	1100.62
2010	1099.09
2011	1110.08
2012	1155.28
2013	1161.91
2014	1169.42
2015	1198.15
2016	1225.36