Year Percent 1990 0 1993 0.09108 1994 0.14716 1995 0.2029 1996 0.85566 1997 2.17454 1998 3.0524 1999 4.75622 2000 6.7314 2001 8.55179 2002 10.24897 2003 22.40294 2004 22.92711 2005 25.92611 2006 28.7912 2007 34.8 2008 42 2009 50.8 2010 61.4 2011 65.76907 2012 70.45 2013 75.46 2014 78.7 2015 77.52327 2016 78.36738 2017 97.99999