Year	Number of
1990	174.13
1991	177.41
1992	182.11
1993	188.14
1994	194.53
1995	201
1996	206.16
1997	211.19
1998	216.64
1999	222.32
2000	228.44
2001	229.69
2002	231.2
2003	233.45
2004	235.86
2005	238.45
2006	244.77
2007	251.29
2008	258.77
2009	266.57
2010	274.75
2011	286.68
2012	299.32
2013	312.43
2014	326.25
2015	340.77
2016	357.45