Year	Number of
1990	1287.25
1991	1292.7
1992	1307.62
1993	1299.53
1994	1289.07
1995	1281.9
1996	1288.09
1997	1292.78
1998	1266.65
1999	1270.15
2000	1283.82
2001	1309.93
2002	1328.73
2003	1355.55
2004	1382.57
2005	1382.4
2006	1369.43
2007	1335.38
2008	1308.46
2009	1294.19
2010	1291.94
2011	1291.79
2012	1293.91
2013	1306.39
2014	1321.02
2015	1341.32
2016	1364.48