Year	Number of
1990	436.22
1991	432.97
1992	432.01
1993	431.28
1994	422.83
1995	424.39
1996	424.71
1997	422.44
1998	425.55
1999	427.93
2000	431.41
2001	436.98
2002	424.12
2003	421.06
2004	412.49
2005	417.06
2006	411.5
2007	411.32
2008	408.33
2009	407.45
2010	396.94
2011	393.49
2012	385.33
2013	377.21
2014	371.81
2015	369.39
2016	367.1