Year	Number of
1990	391.66
1991	404.02
1992	416.14
1993	425.91
1994	461.22
1995	463.71
1996	452.93
1997	424.88
1998	426.76
1999	437.18
2000	434.91
2001	427.97
2002	419.78
2003	419.25
2004	418.55
2005	407.1
2006	413.59
2007	421.74
2008	429.27
2009	435.95
2010	445.68
2011	438.4
2012	439.44
2013	442.14
2014	456.03
2015	445.1
2016	432.72