Year	Number of
1990	1265.69
1991	1238.12
1992	1204.71
1993	1224.48
1994	1270.56
1995	1340.29
1996	1363.71
1997	1330.84
1998	1326.25
1999	1334.44
2000	1343.25
2001	1378.66
2002	1412.01
2003	1447.91
2004	1501.13
2005	1522.82
2006	1554.08
2007	1578.26
2008	1601.03
2009	1674.35
2010	1748.53
2011	1775.04
2012	1802.69
2013	1858.83
2014	1872.84
2015	1910.53
2016	1966.61