Year	Number of
1990	803.15
1991	834.88
1992	859.28
1993	885.94
1994	912.88
1995	930.8
1996	951.56
1997	966.08
1998	990.56
1999	1008.62
2000	1035.88
2001	1055.87
2002	1089.42
2003	1113.81
2004	1135.71
2005	1170.85
2006	1210.02
2007	1241.46
2008	1278.07
2009	1312.89
2010	1342.05
2011	1374.4
2012	1405.05
2013	1432.6
2014	1453.22
2015	1472.95
2016	1496.79