Year	Number of
1990	1308.86
1991	1286.33
1992	1296.08
1993	1304.13
1994	1319.45
1995	1353.27
1996	1375.78
1997	1366.46
1998	1328.3
1999	1300.57
2000	1301.97
2001	1318.99
2002	1319.63
2003	1309.5
2004	1274.05
2005	1267.68
2006	1244.49
2007	1221.77
2008	1230.32
2009	1228.5
2010	1187.67
2011	1122.03
2012	1123.71
2013	1137.03
2014	1136.55
2015	1101.44
2016	1085.84