Year Age 1990 1000 1991 1600 1992 2500 1993 3700 1994 5200 1995 6900 1996 8600 1997 10000 1998 12000 1999 13000 2000 14000 2001 15000 2002 15000 2003 16000 2004 16000 2005 15000 2006 15000 2007 14000 2008 12000 2009 11000