Year	Number of
1990	1492.49
1991	1476.06
1992	1455.1
1993	1445.99
1994	1419.78
1995	1432.43
1996	1427.47
1997	1408.2
1998	1403.42
1999	1404.41
2000	1388.17
2001	1376.88
2002	1360.83
2003	1357.55
2004	1335.46
2005	1335.55
2006	1309.37
2007	1300.62
2008	1288.79
2009	1281.38
2010	1267.16
2011	1259.8
2012	1258.49
2013	1241.71
2014	1232.29
2015	1236.04
2016	1240.7