Year	Number of
1990	187.25
1991	185.05
1992	191.08
1993	190.62
1994	192.24
1995	187.9
1996	183.75
1997	179.57
1998	180.22
1999	183.95
2000	189.1
2001	193.45
2002	202.49
2003	219.01
2004	229.74
2005	238.7
2006	246.55
2007	258.19
2008	272.02
2009	280.62
2010	287.63
2011	287.3
2012	303
2013	293.51
2014	297.42
2015	304.23
2016	307.48