Year	Number of
1990	310.73
1991	324.28
1992	343.95
1993	365.34
1994	383.74
1995	406.75
1996	406.58
1997	413.87
1998	420.73
1999	436.02
2000	455.73
2001	469.23
2002	481.48
2003	497.65
2004	512.6
2005	533.41
2006	550.29
2007	561.62
2008	573.1
2009	587.84
2010	601.74
2011	622.35
2012	625.63
2013	641.22
2014	666.82
2015	683.14
2016	704.13