Year	Number of
1990	1193.99
1991	1222.08
1992	1248.89
1993	1272.7
1994	1298.11
1995	1325.75
1996	1307.26
1997	1289.37
1998	1270.89
1999	1256.72
2000	1247.46
2001	1264.66
2002	1286.26
2003	1316.87
2004	1347.47
2005	1377.17
2006	1378.59
2007	1378.56
2008	1377.4
2009	1383.66
2010	1400.9
2011	1407.82
2012	1424.03
2013	1441.53
2014	1452.8
2015	1455.45
2016	1456.18