Year	Number of
1990	579.5
1991	590.49
1992	603.13
1993	616.27
1994	624.76
1995	629.09
1996	628.9
1997	637.02
1998	634.87
1999	646.04
2000	652.1
2001	659.13
2002	677.94
2003	689.15
2004	701.46
2005	715.39
2006	725.92
2007	736.68
2008	747.48
2009	758.11
2010	769.32
2011	777.88
2012	788.76
2013	799.51
2014	811.78
2015	824.95
2016	837.36