Year	Number of
1990	1048.97
1991	1083.12
1992	1118.98
1993	1174.08
1994	1193.24
1995	1231.39
1996	1212.76
1997	1208.22
1998	1183.11
1999	1187.03
2000	1157.19
2001	1171.07
2002	1219.26
2003	1207.96
2004	1219.5
2005	1227.97
2006	1210.58
2007	1185.51
2008	1180.49
2009	1182.57
2010	1175.14
2011	1184.4
2012	1099.74
2013	1079.69
2014	1041.49
2015	1017.81
2016	1008.71