Year	Number of
1990	975.48
1991	1000.06
1992	1031.43
1993	1058.35
1994	1064.01
1995	1071.64
1996	1076.9
1997	1085.39
1998	1095.03
1999	1098.08
2000	1084.2
2001	1080.3
2002	1078.81
2003	1079.2
2004	1075.95
2005	1076.99
2006	1080.07
2007	1092.11
2008	1091.75
2009	1082.67
2010	1087.81
2011	1095.77
2012	1092.08
2013	1092.7
2014	1104.22
2015	1131.09
2016	1158.38