Year	Number of
1990	176.34
1991	186.56
1992	197.29
1993	209.47
1994	222.38
1995	236.09
1996	256.41
1997	278.46
1998	303.49
1999	330.88
2000	360.91
2001	386.97
2002	415.34
2003	447.51
2004	481.75
2005	518.1
2006	548.68
2007	580.43
2008	613.66
2009	650.47
2010	691.58
2011	735.08
2012	782.99
2013	833.41
2014	886.46
2015	941.83
2016	1003.61