Year	Number of
1990	333
1991	321.44
1992	315.36
1993	305.21
1994	304.89
1995	306.99
1996	299.25
1997	305.32
1998	296.18
1999	300.26
2000	298.48
2001	295.65
2002	298.44
2003	299.05
2004	301.2
2005	311.59
2006	317.78
2007	315.53
2008	306.09
2009	301.11
2010	296.22
2011	287.76
2012	279.87
2013	280.24
2014	290.27
2015	298.4
2016	305.27