Year	Number of
1990	1149.41
1991	1204.76
1992	1289.29
1993	1370.63
1994	1413.48
1995	1455.66
1996	1464.81
1997	1482
1998	1500.22
1999	1533.31
2000	1496.41
2001	1500.04
2002	1482.66
2003	1461.81
2004	1467.05
2005	1461.01
2006	1417.6
2007	1378.49
2008	1335.23
2009	1348.92
2010	1348.28
2011	1339.16
2012	1241.51
2013	1219.64
2014	1171.12
2015	1162.87
2016	1165.05