Year	Number of
1990	324.89
1991	328.25
1992	333.86
1993	343.76
1994	357.62
1995	374.9
1996	383.67
1997	386.35
1998	386.47
1999	383.6
2000	382.57
2001	387.58
2002	400.33
2003	409.07
2004	416.42
2005	421.92
2006	419.73
2007	413.73
2008	410.1
2009	415.04
2010	423.73
2011	432.4
2012	438
2013	442.55
2014	448.41
2015	466.77
2016	486.33