Year	Number of
1990	487.29
1991	498.18
1992	483.87
1993	508.94
1994	507.26
1995	498.68
1996	463.42
1997	432.61
1998	431.77
1999	418.78
2000	408.01
2001	423.34
2002	411.89
2003	424.64
2004	416.34
2005	441.89
2006	450.35
2007	464.05
2008	476.06
2009	425.09
2010	426.33
2011	428.56
2012	429.14
2013	429.88
2014	416.09
2015	427.25
2016	436.45