Year	Number of
1990	475.01
1991	508.97
1992	563.13
1993	568.45
1994	600.91
1995	604.5
1996	606.24
1997	596.35
1998	587.85
1999	586.74
2000	586.86
2001	580.86
2002	592.01
2003	587.12
2004	593.69
2005	596.68
2006	587.66
2007	589.89
2008	594.45
2009	593.1
2010	602.13
2011	601.24
2012	610.75
2013	627.52
2014	649.31
2015	649.59
2016	653.11