Year	Number of
1990	226.23
1991	228.86
1992	247.86
1993	275.76
1994	297.98
1995	302.38
1996	295.27
1997	298.16
1998	306.62
1999	317.64
2000	336.53
2001	339.8
2002	344.56
2003	341.59
2004	341.12
2005	325.46
2006	313.14
2007	298.43
2008	283.1
2009	275.23
2010	271.04
2011	267.59
2012	266.41
2013	269.31
2014	272.79
2015	275.48
2016	278.65