Year	Number of
1990	202.2
1991	207.1
1992	212.86
1993	219.5
1994	226.34
1995	233.74
1996	241.5
1997	250.22
1998	257.08
1999	265.35
2000	271.83
2001	282.2
2002	284.89
2003	290.16
2004	296.02
2005	305.03
2006	309.96
2007	314.87
2008	320.22
2009	325.85
2010	329.63
2011	330.82
2012	336.31
2013	342.47
2014	349.4
2015	356.7
2016	363.61