Year Percent 1990 0 1995 0.00775 1996 0.38946 1997 0.78343 1998 1.97025 1999 2.37625 2000 3.97368 2001 11.93645 2002 27.83632 2003 39.68963 2004 49.8 2005 52.5 2006 55.3 2007 58.2 2008 61.4 2009 64.7 2010 65.1 2011 66.5 2012 71.2 2013 71.8 2014 75.16 2015 76.11 2016 79.5494