Year	Number of
1990	1063.74
1991	1064.65
1992	1071.1
1993	1070.35
1994	1060.7
1995	1074.06
1996	1079.2
1997	1089.41
1998	1106.88
1999	1116.42
2000	1128.89
2001	1129.52
2002	1117.33
2003	1131.67
2004	1133.51
2005	1134.31
2006	1131.58
2007	1134.92
2008	1138.68
2009	1146.44
2010	1140.97
2011	1150.32
2012	1165.47
2013	1145.24
2014	1136.55
2015	1155.39
2016	1166.55