Year Number 1994 3.7140535134 1995 4.8702019255 1996 6.0263503376 1997 7.1824987497 1998 8.3386471618 1999 9.4947955739 2000 10.650943986 2001 11.8070923981 2002 12.9632408102 2003 12.9632408102 2004 12.9632408102 2005 12.9632408102 2006 12.9632408102 2007 12.9632408102 2008 12.9632408102 2009 12.9632408102 2010 12.9632408102 2011 12.9632408102 2012 12.9632408102 2013 12.9632408102 2014 12.9632408102 2015 12.9632408102 2016 12.9632408102 2017 12.9632408102 2018 12.9632408102 2019 12.9632408102 2020 12.9632408102