Year	Number of
1990	495.6
1991	526.79
1992	551.94
1993	577.6
1994	628.79
1995	662.52
1996	688.36
1997	742.35
1998	806.1
1999	882.54
2000	978.39
2001	1033.56
2002	1098.89
2003	1155.04
2004	1211.42
2005	1248
2006	1294.42
2007	1334
2008	1371.76
2009	1424.74
2010	1477.68
2011	1503.99
2012	1538.16
2013	1549.12
2014	1572.06
2015	1599.42
2016	1629.27