Year	Number of
1990	210.36
1991	213.65
1992	222.33
1993	233.61
1994	238
1995	243.31
1996	242.24
1997	242.36
1998	245.4
1999	249.96
2000	254.27
2001	261.55
2002	268.54
2003	276.41
2004	284.87
2005	287.82
2006	289.98
2007	292.78
2008	295.97
2009	299.67
2010	303.53
2011	306.99
2012	311.99
2013	316.42
2014	324.29
2015	333.63
2016	343.06