Year	Number of
1990	498.63
1991	512.95
1992	481.39
1993	479.46
1994	540.44
1995	541.1
1996	494.61
1997	407.33
1998	381.56
1999	383.66
2000	383.35
2001	363.75
2002	361.33
2003	363.42
2004	366.62
2005	390.33
2006	378.9
2007	379.64
2008	369.88
2009	366.36
2010	377.6
2011	331.16
2012	336.93
2013	314.74
2014	325.42
2015	335.25
2016	336.27