Year	Number of
1990	567.7
1991	574.87
1992	601.34
1993	587.56
1994	610.46
1995	594.86
1996	635.97
1997	728.88
1998	753.12
1999	777.49
2000	812.08
2001	790.16
2002	790.1
2003	795.27
2004	795.03
2005	806.38
2006	814.64
2007	806.7
2008	794.36
2009	794.1
2010	798.23
2011	791.99
2012	766.92
2013	755.51
2014	761.48
2015	766.84
2016	772.26