Year	Number of
1990	206.66
1991	217.73
1992	229.11
1993	240.44
1994	252.37
1995	265.05
1996	279.33
1997	294.62
1998	310.72
1999	328.15
2000	347.21
2001	360.99
2002	375.46
2003	390.65
2004	406.7
2005	423.78
2006	438.96
2007	455.04
2008	471.39
2009	488.66
2010	507.24
2011	533.5
2012	561.76
2013	592.96
2014	626.64
2015	662.92
2016	700.68