Year	Number of
1990	1102.79
1991	1147.09
1992	1176.24
1993	1200.48
1994	1225.41
1995	1250.51
1996	1263.41
1997	1278.99
1998	1296.78
1999	1312.77
2000	1330.18
2001	1351.1
2002	1370.22
2003	1390.38
2004	1411.52
2005	1436.66
2006	1447.84
2007	1457.16
2008	1464.87
2009	1473.55
2010	1486.81
2011	1532.04
2012	1577.62
2013	1626.62
2014	1674.54
2015	1722.91
2016	1772.14