Year	Number of
1990	1257.98
1991	1267.9
1992	1280.59
1993	1290.66
1994	1305.07
1995	1345.15
1996	1376.64
1997	1383.78
1998	1370.34
1999	1366.4
2000	1367.68
2001	1355.93
2002	1334.57
2003	1323.96
2004	1314.62
2005	1294.89
2006	1295.57
2007	1292.72
2008	1292.58
2009	1294.36
2010	1297.6
2011	1296
2012	1292.92
2013	1311.9
2014	1333.2
2015	1342.43
2016	1368.48