Year	Number of
1990	733.99
1991	730.29
1992	737.11
1993	713.13
1994	674.65
1995	622.34
1996	596.26
1997	596.7
1998	602.6
1999	601.61
2000	595.04
2001	585.16
2002	597.65
2003	620.84
2004	626.58
2005	550.75
2006	500.32
2007	487.57
2008	524.94
2009	566.34
2010	575.81
2011	584.62
2012	607.35
2013	590.72
2014	600.5
2015	574.47
2016	559.12