Year	Number of
1990	513.67
1991	535.01
1992	551.14
1993	561.92
1994	579.83
1995	585.93
1996	592.23
1997	591
1998	594.34
1999	602.93
2000	606.12
2001	618.61
2002	618.06
2003	619.2
2004	626.84
2005	626.97
2006	644.73
2007	658.42
2008	675.27
2009	674.02
2010	675.91
2011	688.05
2012	701.49
2013	712.79
2014	728.95
2015	758.97
2016	784.59