Year	Number of
1990	518.68
1991	522.73
1992	534.04
1993	548.03
1994	562.54
1995	582.14
1996	600.42
1997	621.25
1998	653.3
1999	678.67
2000	700.68
2001	718.94
2002	741.32
2003	772.21
2004	788.46
2005	799.75
2006	809.67
2007	829.36
2008	860.54
2009	885.59
2010	911.05
2011	927.66
2012	944.06
2013	962.13
2014	986.04
2015	1014.07
2016	1039.08