Year	Number of
1990	1310.07
1991	1292.54
1992	1298.95
1993	1305.46
1994	1320.5
1995	1354.48
1996	1373.95
1997	1363.03
1998	1325.4
1999	1297.8
2000	1301.52
2001	1316.83
2002	1319.26
2003	1312.44
2004	1283.36
2005	1279.74
2006	1264.8
2007	1250.52
2008	1268.87
2009	1275.73
2010	1245.62
2011	1190.31
2012	1197.84
2013	1218.47
2014	1224.34
2015	1197.85
2016	1197.64