Year	Number of
1990	1104.16
1991	1121.03
1992	1130.03
1993	1117.19
1994	1156.21
1995	1190.66
1996	1221.53
1997	1254.1
1998	1206.2
1999	1211.85
2000	1223.99
2001	1211.97
2002	1222.33
2003	1230.61
2004	1254.51
2005	1299.52
2006	1321.31
2007	1322.16
2008	1312.76
2009	1300.32
2010	1293.94
2011	1293.55
2012	1287.41
2013	1282.68
2014	1271.66
2015	1279.52
2016	1287.4