Year	Number of
1990	194.33
1991	202.79
1992	210.59
1993	217.4
1994	224.41
1995	233.11
1996	240.28
1997	248.18
1998	257.77
1999	268.37
2000	278.33
2001	292.17
2002	307.7
2003	320.64
2004	335.7
2005	351.63
2006	367.08
2007	382.36
2008	397.26
2009	412
2010	425.85
2011	439.64
2012	452.66
2013	464.91
2014	478.86
2015	492.05
2016	504.18