Year	Number of
1990	652.68
1991	667.86
1992	658.65
1993	701.08
1994	700.97
1995	674.89
1996	624.03
1997	583.39
1998	564.69
1999	552.39
2000	534.92
2001	554.87
2002	548.28
2003	545.33
2004	546.64
2005	574.83
2006	580.13
2007	601.72
2008	565.38
2009	519.04
2010	520.52
2011	507.39
2012	500.8
2013	503.31
2014	486.71
2015	483.49
2016	486.69