Year Number of 1990 7823.27 1991 7983.79 1992 8153.23 1993 8324.14 1994 8499.85 1995 8686.6 1996 8758.23 1997 8836.41 1998 8918.85 1999 9000.48 2000 9072.63 2001 9132.13 2002 9191.08 2003 9249.32 2004 9317.54 2005 9401.23 2006 9497.99 2007 9601.87 2008 9704.4 2009 9812.81 2010 9936.21 2011 10033.17 2012 10103.26 2013 10162.09 2014 10231.59 2015 10303.47 2016 10392.27