Year	Number of
1990	183.82
1991	188.61
1992	194.22
1993	200.44
1994	206.98
1995	213.84
1996	218.26
1997	222.87
1998	227.91
1999	233.56
2000	240.09
2001	245.17
2002	251.15
2003	258.06
2004	265.46
2005	273.4
2006	278.96
2007	284.77
2008	291.27
2009	298.29
2010	305.99
2011	314.2
2012	323.21
2013	332.71
2014	342.85
2015	353.6
2016	364.75