Year	Number of
1990	484.39
1991	482.44
1992	485.43
1993	486.31
1994	491.31
1995	498.05
1996	517.91
1997	536.64
1998	561.33
1999	575.38
2000	600.54
2001	619.68
2002	630.97
2003	647.54
2004	665.42
2005	684.74
2006	710.54
2007	741.23
2008	771.37
2009	794.05
2010	833.95
2011	863.92
2012	897.28
2013	922.97
2014	935.97
2015	939.42
2016	938.81