Year	Number of
1990	146.95
1991	148.45
1992	149.69
1993	150.44
1994	152.07
1995	154.98
1996	161.96
1997	170.45
1998	180.53
1999	190.89
2000	201.12
2001	210.09
2002	219
2003	229.3
2004	240.06
2005	251.47
2006	260.05
2007	269.05
2008	278.56
2009	288.65
2010	299.35
2011	304.07
2012	309.04
2013	313.89
2014	319.16
2015	324.94
2016	330.24