Year	Number of
1990	842.16
1991	858.83
1992	882.69
1993	920.95
1994	928.34
1995	955.41
1996	978.17
1997	1014.42
1998	1043.69
1999	1061.87
2000	1095.89
2001	1115.82
2002	1162.95
2003	1197.42
2004	1228.17
2005	1237.02
2006	1258.11
2007	1287.55
2008	1334.69
2009	1389.66
2010	1445.22
2011	1489.51
2012	1535.59
2013	1577.29
2014	1622.27
2015	1669.57
2016	1711.98